JP2016092973A - Harness connection structure and battery pack - Google Patents

Harness connection structure and battery pack Download PDF

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JP2016092973A
JP2016092973A JP2014225061A JP2014225061A JP2016092973A JP 2016092973 A JP2016092973 A JP 2016092973A JP 2014225061 A JP2014225061 A JP 2014225061A JP 2014225061 A JP2014225061 A JP 2014225061A JP 2016092973 A JP2016092973 A JP 2016092973A
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base member
connection structure
harness connection
fastening
bus bar
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JP6201961B2 (en
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拓 井上
Hiroshi Inoue
拓 井上
加藤　崇行
Takayuki Kato
崇行 加藤
浩生 植田
Hiromi Ueda
浩生 植田
文彦 石黒
Fumihiko Ishiguro
文彦 石黒
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Toyota Industries Corp
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Toyota Industries Corp
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
    • H01M50/218—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders characterised by the material
    • H01M50/22—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders characterised by the material of the casings or racks
    • H01M50/222—Inorganic material
    • H01M50/224—Metals
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
    • H02G3/00—Installations of electric cables or lines or protective tubing therefor in or on buildings, equivalent structures or vehicles
    • H02G3/02—Details
    • H02G3/08—Distribution boxes; Connection or junction boxes
    • H02G3/16—Distribution boxes; Connection or junction boxes structurally associated with support for line-connecting terminals within the box
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K7/00—Constructional details common to different types of electric apparatus
    • H05K7/02—Arrangements of circuit components or wiring on supporting structure
    • H05K7/06—Arrangements of circuit components or wiring on supporting structure on insulating boards, e.g. wiring harnesses
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
    • H01M50/262—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders with fastening means, e.g. locks
    • 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

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Inorganic Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Battery Mounting, Suspending (AREA)
  • Connection Of Batteries Or Terminals (AREA)
  • Connection Or Junction Boxes (AREA)

Abstract

PROBLEM TO BE SOLVED: To provide a harness connection structure and a battery pack that are able to ensure satisfactory assembly workability and able to prevent harness connection failure.SOLUTION: A harness connection structure 11 comprises: terminal bases 12 arranged with a predetermined clearance between them; a connection member 13 connecting the terminal bases 12, 12; and a plurality of fastening parts 14 provided on the connection member 13. The connection member 13 comprises: a bus bar member 31 provided with a through-hole 31b according to the position of each fastening part 14; and a base member 32 to which a bolt 33 is fixed according to the position of each fastening part 14 and joined to the bus bar member 31 while the bolt 33 is passed through the through-hole 31b. The base member 32 is formed from a material lower than the bus bar member 31 in thermal expansion coefficient. A thin wall part K is provided between the fastening parts 14, 14.SELECTED DRAWING: Figure 3

Description

本発明は、ハーネス接続構造及び電池パックに関する。   The present invention relates to a harness connection structure and a battery pack.

従来、例えば特許文献１に記載の蓄電装置のように、電池セルの配列体を含んで構成された電池モジュールを筐体内に収容してなる電池パックがある。このような電池パックは、電気自動車に用いられるほか、例えば特許文献２に記載のローリフトトラックのようなフォークリフトのバッテリーとしても使用される。   2. Description of the Related Art Conventionally, there is a battery pack in which a battery module configured to include an array of battery cells is housed in a casing, such as the power storage device described in Patent Document 1. Such a battery pack is used not only for an electric vehicle but also for a forklift battery such as a low lift truck described in Patent Document 2, for example.

特開２０１２−３３３０６号公報JP 2012-33306 A 特許第４００１３３５号公報Japanese Patent No. 4001335

上述した電池パックでは、電池モジュールに電気的に接続される各種のハーネスが配線され、各ハーネスの電気的な接続にあたって筐体内にハーネス接続構造が設けられる場合がある。ハーネス接続構造は、例えば所定の間隔をもって筐体に固定される端子台と、端子台を連結するバスバー部材と、ハーネスの接続端子をバスバー部材にボルト−ナットで締結する締結部とを備えて構成される。   In the battery pack described above, various harnesses that are electrically connected to the battery module are wired, and a harness connection structure may be provided in the housing for electrical connection of each harness. The harness connection structure includes, for example, a terminal block that is fixed to the housing at a predetermined interval, a bus bar member that couples the terminal block, and a fastening portion that fastens the connection terminal of the harness to the bus bar member with a bolt-nut. Is done.

ハーネス接続構造の組立作業性を確保する観点から、締結部に対応してバスバー部材に貫通孔を設けると共に、溶接等によってボルトを予め固定したベース部材を用意し、貫通孔にボルトを通した状態でベース部材とバスバー部材とを結合させた構造を採用することが考えられる。しかしながら、このような構造を採用した場合、バスバー部材とベース部材との熱膨張率差が問題となる。通電等によってこれらの部材の温度が上昇した場合、締結部にすべり荷重が生じ、ナットの緩みなどに起因するハーネスの接続不良が生じるおそれがある。   From the viewpoint of ensuring assembly workability of the harness connection structure, a through hole is provided in the bus bar member corresponding to the fastening portion, and a base member in which a bolt is fixed in advance by welding or the like is prepared, and the bolt is passed through the through hole. It is conceivable to adopt a structure in which the base member and the bus bar member are combined. However, when such a structure is adopted, a difference in thermal expansion coefficient between the bus bar member and the base member becomes a problem. When the temperature of these members rises due to energization or the like, a sliding load is generated at the fastening portion, and there is a possibility that a connection failure of the harness due to loosening of the nut or the like may occur.

本発明は、上記課題の解決のためになされたものであり、良好な組立作業性を確保でき、かつハーネスの接続不良の発生を抑制できるハーネス接続構造及び電池パックを提供することを目的とする。   The present invention has been made to solve the above problems, and an object of the present invention is to provide a harness connection structure and a battery pack capable of ensuring good assembly workability and suppressing the occurrence of connection failure of the harness. .

上記課題の解決のため、本発明に係るハーネス接続構造は、所定の間隔をもって配置された端子台と、端子台間を連結する連結部材と、連結部材に設けられた複数の締結部と、を備え、連結部材は、締結部の位置に応じて貫通孔が設けられたバスバー部材と、締結部の位置に応じてボルトが固定され、貫通孔にボルトを通した状態でバスバー部材に結合されたベース部材と、を有し、ベース部材は、バスバー部材に比べて熱膨張率の小さい材料によって形成され、前記締結部間に減肉部が設けられている。   In order to solve the above-described problems, a harness connection structure according to the present invention includes a terminal block arranged at a predetermined interval, a connecting member that connects the terminal blocks, and a plurality of fastening portions provided on the connecting member. The connecting member is connected to the bus bar member in which the through hole is provided according to the position of the fastening portion, the bolt is fixed according to the position of the fastening portion, and the bolt is passed through the through hole. The base member is made of a material having a smaller coefficient of thermal expansion than the bus bar member, and a thinned portion is provided between the fastening portions.

このハーネス接続構造では、ボルトを予め固定したベース部材を用いることで組立容易性を良好に確保できる。また、このハーネス接続構造では、ベース部材がバスバー部材に比べて熱膨張率の小さい材料によって形成され、締結部間に減肉部が設けられている。減肉部を設けることで、荷重に対するベース部材の変形容易性が高められる。このため、ベース部材の熱膨張率がバスバー部材の熱膨張率より小さい場合でも、連結部材の温度上昇時にバスバー部材の膨張に対するベース部材の膨張の追従性を確保できる。したがって、締結部でのすべり荷重を低減でき、ナットの緩みなどに起因するハーネスの接続不良の発生を抑制できる。   In this harness connection structure, the ease of assembly can be satisfactorily ensured by using a base member to which bolts are fixed in advance. Moreover, in this harness connection structure, the base member is formed of a material having a smaller coefficient of thermal expansion than the bus bar member, and a thinned portion is provided between the fastening portions. By providing the thinned portion, the ease of deformation of the base member with respect to the load is enhanced. For this reason, even when the thermal expansion coefficient of the base member is smaller than the thermal expansion coefficient of the bus bar member, it is possible to ensure the followability of the expansion of the base member with respect to the expansion of the bus bar member when the temperature of the connecting member rises. Therefore, the sliding load at the fastening portion can be reduced, and the occurrence of poor connection of the harness due to loosening of the nut can be suppressed.

また、締結部は、前記ベース部材に固定された前記ボルトにナットを螺合して構成される締結部と、前記端子台に設けられたボルトにナットを螺合して構成される締結部とを有していてもよい。このような締結部の構成により、締結部にハーネスの接続端子を好適に接続できる。   The fastening portion includes a fastening portion configured by screwing a nut to the bolt fixed to the base member, and a fastening portion configured by screwing a nut to the bolt provided on the terminal block; You may have. With such a configuration of the fastening portion, the connection terminal of the harness can be suitably connected to the fastening portion.

また、減肉部は、締結部間を結ぶ第１の方向と交差する第２の方向に形成されたスリットであってもよい。このようなスリットによって減肉部を構成することで、減肉部においてベース部材の断面積が十分に小さくなる。これにより、連結部材の温度上昇時に減肉部に応力が集中し、荷重に対するベース部材の変形容易性がより確実に高められる。   Further, the thinned portion may be a slit formed in a second direction intersecting with a first direction connecting the fastening portions. By forming the thinned portion by such a slit, the cross-sectional area of the base member becomes sufficiently small in the thinned portion. Thereby, stress concentrates on the thinned portion when the temperature of the connecting member rises, and the ease of deformation of the base member with respect to the load is more reliably increased.

また、スリットは、ベース部材における第２の方向の一縁部に到達する第１のスリットと、ベース部材における第２の方向の他縁部に到達する第２のスリットと、を有し、第１のスリットと第２のスリットとが各締結部間で互い違いとなるように設けられていてもよい。このような構成によれば、ベース部材における第２の方向の一縁部及び他縁部から切り込みを入れることでスリットを容易に形成できる。また、第１のスリットと第２のスリットとを各締結部間で互い違いとすることで、連結部材の温度上昇の際にベース部材が第２の方向に歪んで変形することを防止できる。   The slit includes a first slit that reaches one edge of the base member in the second direction, and a second slit that reaches the other edge of the base member in the second direction. 1 slit and 2nd slit may be provided so that it may become alternate between each fastening part. According to such a structure, a slit can be easily formed by making a notch from one edge part and the other edge part of the 2nd direction in a base member. In addition, by making the first slit and the second slit alternate between the fastening portions, it is possible to prevent the base member from being distorted and deformed in the second direction when the temperature of the connecting member rises.

また、減肉部は、締結部間を結ぶ第１の方向と交差する第２の方向に形成された切欠きであり、ベース部材における第２の方向の一縁部に形成された第１の切欠きと、ベース部材における第２の方向の他縁部に形成された第２の切欠きとが互いに対向するように設けられていてもよい。このような構成によれば、ベース部材における第２の方向の一縁部及び他縁部から切り込みを入れることで切欠きを容易に形成できる。また、第１の切欠きと第２の切欠きとを互いに対向する位置とすることで、連結部材の温度上昇の際にベース部材が第２の方向に歪んで変形することを防止できる。   Further, the thinned portion is a notch formed in a second direction intersecting with the first direction connecting the fastening portions, and the first portion formed in one edge portion of the base member in the second direction. The notch and the second notch formed at the other edge of the base member in the second direction may be provided so as to face each other. According to such a structure, a notch can be easily formed by notching from one edge part and other edge part of the 2nd direction in a base member. In addition, by setting the first cutout and the second cutout to face each other, the base member can be prevented from being distorted and deformed in the second direction when the temperature of the connecting member rises.

また、減肉部は、締結部間を結ぶ第１の方向と交差する第２の方向に延在する凹部であってもよい。この場合、凹部によって減肉部を容易に形成できる。   Further, the thinned portion may be a concave portion extending in a second direction intersecting with a first direction connecting the fastening portions. In this case, the reduced thickness portion can be easily formed by the recess.

また、減肉部は、複数の窪み部であってもよい。この場合、窪み部によって減肉部を容易に形成できる。   Moreover, a plurality of hollow parts may be sufficient as a thinning part. In this case, the thinned portion can be easily formed by the recessed portion.

また、本発明の一側面に係る電池パックは、複数の電池セルを配列してなる電池モジュールと、上記ハーネス接続構造と、を筐体内に配置してなる。   The battery pack according to one aspect of the present invention includes a battery module in which a plurality of battery cells are arranged and the harness connection structure arranged in a housing.

この電池パックでは、筐体内に電池モジュールと上記ハーネス接続構造とが配置されている。このハーネス接続構造では、ボルトを予め固定したベース部材を用いることで組立容易性を良好に確保できる。また、このハーネス接続構造では、ベース部材がバスバー部材に比べて熱膨張率の小さい材料によって形成され、締結部間に減肉部が設けられている。減肉部を設けることで、荷重に対するベース部材の変形容易性が高められる。このため、ベース部材の熱膨張率がバスバー部材の熱膨張率より小さい場合でも、連結部材の温度上昇時にバスバー部材の膨張に対するベース部材の膨張の追従性を確保できる。したがって、締結部でのすべり荷重を低減でき、ナットの緩みなどに起因するハーネスの接続不良の発生を抑制できる。   In this battery pack, a battery module and the harness connection structure are arranged in a housing. In this harness connection structure, the ease of assembly can be satisfactorily ensured by using a base member to which bolts are fixed in advance. Moreover, in this harness connection structure, the base member is formed of a material having a smaller coefficient of thermal expansion than the bus bar member, and a thinned portion is provided between the fastening portions. By providing the thinned portion, the ease of deformation of the base member with respect to the load is enhanced. For this reason, even when the thermal expansion coefficient of the base member is smaller than the thermal expansion coefficient of the bus bar member, it is possible to ensure the followability of the expansion of the base member with respect to the expansion of the bus bar member when the temperature of the connecting member rises. Therefore, the sliding load at the fastening portion can be reduced, and the occurrence of poor connection of the harness due to loosening of the nut can be suppressed.

本発明によれば、良好な組立作業性を確保でき、かつハーネスの接続不良の発生を抑制できる。   ADVANTAGE OF THE INVENTION According to this invention, favorable assembly workability | operativity can be ensured and generation | occurrence | production of the poor connection of a harness can be suppressed.

本発明の一実施形態に係る電池パックの内部構成を示す図である。It is a figure which shows the internal structure of the battery pack which concerns on one Embodiment of this invention. ジャンクションボックス内に収容されるハーネス接続構造の一例を示す要部拡大図である。It is a principal part enlarged view which shows an example of the harness connection structure accommodated in a junction box. 図２におけるＩＩＩ−ＩＩＩ線断面図である。It is the III-III sectional view taken on the line in FIG. ベース部材の平面図である。It is a top view of a base member. 減肉部の変形例を示す要部拡大平面図である。It is a principal part enlarged plan view which shows the modification of a thinning part. 減肉部の別の変形例を示す要部拡大斜視図である。It is a principal part expansion perspective view which shows another modification of a thinning part.

以下、図面を参照しながら、本発明に係るハーネス接続構造及び電池パックの好適な実施形態について詳細に説明する。   Hereinafter, a preferred embodiment of a harness connection structure and a battery pack according to the present invention will be described in detail with reference to the drawings.

図１は、本発明の一実施形態に係る電池パックの内部構成を示す図である。同図に示すように、電池パック１は、筐体２と、複数（本実施形態では５体）の電池モジュール３と、コネクタ４と、ジャンクションボックス５とを含んで構成されている。電池パック１は、例えばローリフトトラックといったフォークリフトのバッテリーとして用いられる装置であり、所定のバッテリー収容部に収容されている。   FIG. 1 is a diagram showing an internal configuration of a battery pack according to an embodiment of the present invention. As shown in FIG. 1, the battery pack 1 includes a housing 2, a plurality (5 in this embodiment) of battery modules 3, a connector 4, and a junction box 5. The battery pack 1 is a device used as a forklift battery such as a low lift truck, for example, and is accommodated in a predetermined battery accommodating portion.

筐体２は、例えば金属によって形成され、バッテリー収容部の形状に応じた有底の箱型形状をなしている。電池モジュール３は、ブラケットなどを介して筐体２の側板２ａに固定されている。電池モジュール３は、伝熱プレートを介して複数の電池セルを配列した配列体と、電池セルの配列方向に配列体に拘束荷重を付加する拘束部材とを含んで構成されている。電池セルは、例えばリチウムイオン電池等の二次電池である。配列体において隣り合う電池セルは、正極端子と負極端子をバスバー部材等で接続することにより、電気的に直列に接続されている。   The housing 2 is made of, for example, metal and has a bottomed box shape corresponding to the shape of the battery housing portion. The battery module 3 is fixed to the side plate 2a of the housing 2 via a bracket or the like. The battery module 3 includes an array body in which a plurality of battery cells are arrayed via a heat transfer plate, and a restraining member that applies a restraining load to the array body in the array direction of the battery cells. The battery cell is a secondary battery such as a lithium ion battery. Adjacent battery cells in the array are electrically connected in series by connecting the positive terminal and the negative terminal with a bus bar member or the like.

コネクタ４は、電池パック１と外部装置とを接続する部分である。コネクタ４は、例えば筐体２における前板２ｂの上部の外側に配置されている。ジャンクションボックス５は、コネクタ４の位置に対応して前板２ｂの上部の内側に配置されている。ジャンクションボックス５内には、一又は複数のハーネス接続構造１１（図２参照）、及びリレーなどが収容されている。ジャンクションボックス５の入力側は、各電池モジュール３から延びるハーネスＨに接続され、出力側はコネクタ４に接続されている。   The connector 4 is a part that connects the battery pack 1 and an external device. For example, the connector 4 is disposed outside the upper portion of the front plate 2 b in the housing 2. The junction box 5 is disposed inside the upper portion of the front plate 2 b corresponding to the position of the connector 4. In the junction box 5, one or a plurality of harness connection structures 11 (see FIG. 2), relays, and the like are accommodated. The input side of the junction box 5 is connected to a harness H extending from each battery module 3, and the output side is connected to the connector 4.

図２は、ジャンクションボックス内に収容されるハーネス接続構造１１の一例を示す要部拡大図である。また、図３は、図２におけるＩＩＩ−ＩＩＩ線断面図である。図２及び図３に示すように、ハーネス接続構造１１は、複数の端子台１２と、連結部材１３と、複数の締結部１４とを備えている。   FIG. 2 is an enlarged view of a main part showing an example of the harness connection structure 11 housed in the junction box. 3 is a cross-sectional view taken along line III-III in FIG. As shown in FIGS. 2 and 3, the harness connection structure 11 includes a plurality of terminal blocks 12, a connecting member 13, and a plurality of fastening portions 14.

端子台１２は、所定の間隔をもって配置されている。端子台１２は、図３に示すように、例えば樹脂によって形成された土台部２１を有している。土台部２１の基端及び先端には、それぞれインサートボルト２２が設けられている。端子台１２は、土台部２１の基端側のインサートボルト２２によって筐体２の側板２ａに対して強固に固定されている。土台部２１の先端側のインサートボルト２２は、連結部材１３の貫通孔１３ａを通って突出しており、ナット２３を螺合することで締結部１４の一つ（締結部１４Ａ）として機能させることができる。   The terminal block 12 is arranged with a predetermined interval. As shown in FIG. 3, the terminal block 12 has a base portion 21 made of, for example, resin. Insert bolts 22 are respectively provided at the base end and the tip end of the base portion 21. The terminal block 12 is firmly fixed to the side plate 2 a of the housing 2 by an insert bolt 22 on the base end side of the base portion 21. The insert bolt 22 on the distal end side of the base portion 21 protrudes through the through hole 13a of the connecting member 13 and can function as one of the fastening portions 14 (fastening portion 14A) by screwing the nut 23. it can.

連結部材１３は、端子台１２間を連結する板状部材である。連結部材１３は、図２に示すように、直線状に延びる第１の部分１３Ａと、第１の部分１３Ａの両端部において、第１の部分１３Ａの幅方向に互いに反対向きに突出する第２の部分１３Ｂ，１３Ｂとを有している。この連結部材１３は、より具体的には、図３に示すように、バスバー部材３１と、ベース部材３２とによって構成されている。バスバー部材３１及びベース部材３２の平面形状は、いずれも上記連結部材１３と同形状となっている。   The connecting member 13 is a plate-like member that connects the terminal blocks 12. As shown in FIG. 2, the connecting member 13 includes a first portion 13A that extends linearly and a second portion that protrudes in opposite directions in the width direction of the first portion 13A at both ends of the first portion 13A. Parts 13B and 13B. More specifically, the connecting member 13 includes a bus bar member 31 and a base member 32 as shown in FIG. The bus bar member 31 and the base member 32 have the same planar shape as that of the connecting member 13.

バスバー部材３１は、例えば銅などの十分な導電性を有する材料によって形成されている。バスバー部材３１には、図３に示すように、締結部１４の位置に応じて、端子台１２のインサートボルト２２を通す貫通孔３１ａと、後述するベース部材３２のボルト３３を通す貫通孔３１ｂとがそれぞれ設けられている。   The bus bar member 31 is formed of a material having sufficient conductivity such as copper. As shown in FIG. 3, the bus bar member 31 has a through hole 31 a through which the insert bolt 22 of the terminal block 12 passes and a through hole 31 b through which a bolt 33 of the base member 32 described later passes according to the position of the fastening portion 14. Are provided.

ベース部材３２は、例えば鉄などの溶接に向いた材料によって形成され、バスバー部材３１に比べて熱膨張率が小さくなっている。ベース部材３２には、端子台１２の位置に応じて、端子台１２のインサートボルト２２を通す貫通孔３２ｃが設けられている。また、ベース部材３２の一面側には、図３及び図４に示すように、締結部１４（締結部１４Ｂ）の位置に応じてボルト３３が予め溶接されている。ベース部材３２は、バスバー部材３１の貫通孔３１ｂにボルト３３を通した状態でバスバー部材３１に結合され、これにより、連結部材１３が形成されている。また、ベース部材３２の貫通孔３２ｃとバスバー部材３１の貫通孔３１ａとが連通し、インサートボルト２２が通る連結部材１３の貫通孔１３ａが形成されている。   The base member 32 is formed of a material suitable for welding such as iron, and has a smaller thermal expansion coefficient than the bus bar member 31. The base member 32 is provided with a through hole 32 c through which the insert bolt 22 of the terminal block 12 is passed according to the position of the terminal block 12. Moreover, as shown in FIG.3 and FIG.4, the bolt 33 is previously welded to the one surface side of the base member 32 according to the position of the fastening part 14 (fastening part 14B). The base member 32 is coupled to the bus bar member 31 in a state where the bolt 33 is passed through the through hole 31b of the bus bar member 31, whereby the connecting member 13 is formed. Further, the through hole 32c of the base member 32 and the through hole 31a of the bus bar member 31 communicate with each other, and the through hole 13a of the connecting member 13 through which the insert bolt 22 passes is formed.

貫通孔３１ｂから突出するボルト３３は、締結部１４として機能する。締結部１４では、各電池モジュール３から延びるハーネスＨの接続端子Ｈａ（図３参照）がボルト３３に係合し、接続端子Ｈａがナット３４で締結されることでハーネスＨが連結部材１３に接続されている。本実施形態では、複数の締結部１４は、端子台１２，１２間を結ぶ連結部材１３の長手方向に沿って略等間隔に設けられている。連結部材１３の長手方向は、ここでは図２におけるＩＩＩ−ＩＩＩ線の延在方向である。締結部１４，１４間を結ぶ方向（第１の方向）は、当該ＩＩＩ−ＩＩＩ線の延在方向と一致している。   The bolt 33 protruding from the through hole 31b functions as the fastening portion 14. In the fastening portion 14, the connection terminal Ha (see FIG. 3) of the harness H extending from each battery module 3 is engaged with the bolt 33, and the connection terminal Ha is fastened with the nut 34, whereby the harness H is connected to the coupling member 13. Has been. In the present embodiment, the plurality of fastening portions 14 are provided at substantially equal intervals along the longitudinal direction of the connecting member 13 that connects the terminal blocks 12 and 12. Here, the longitudinal direction of the connecting member 13 is the extending direction of the III-III line in FIG. A direction (first direction) connecting the fastening portions 14 and 14 coincides with the extending direction of the III-III line.

より具体的には、連結部材１３の第１の部分１３Ａには、一端側（図２における上側）からベース部材３２のボルト３３による締結部１４Ａが４箇所設けられ、最も他端側には、端子台１２のインサートボルト２２による締結部１４Ｂが１箇所設けられている。また、連結部材１３の第２の部分１３Ｂ，１３Ｂには、端子台１２のインサートボルト２２による締結部１４Ｂがそれぞれ１箇所設けられている。   More specifically, the first portion 13A of the connecting member 13 is provided with four fastening portions 14A by bolts 33 of the base member 32 from one end side (upper side in FIG. 2), and on the other end side, One fastening portion 14B by the insert bolt 22 of the terminal block 12 is provided. Further, each of the second portions 13B and 13B of the connecting member 13 is provided with one fastening portion 14B by the insert bolt 22 of the terminal block 12.

また、上述したベース部材３２には、図４に示すように、締結部１４間に減肉部Ｋが設けられている。図４の例では、減肉部Ｋは、連結部材１３の幅方向（第１の方向に交差する第２の方向）に直線状に延びるスリット４１によって構成されている。スリット４１は、ベース部材３２の幅方向の両端には到達しないように、ベース部材３２の幅方向の中央部分に延在している。すなわち、減肉部Ｋでは、ベース部材３２の中央部分がスリット４１によって分断され、幅方向の両端のみでベース部材３２がつながった状態となっている。なお、図４では、ベース部材３２の長手方向におけるスリット４１の位置は、締結部１４，１４間の中点の位置となっているが、この位置は締結部１４，１４間の任意の位置であってよい。   Further, as shown in FIG. 4, the base member 32 described above is provided with a thinned portion K between the fastening portions 14. In the example of FIG. 4, the thinned portion K is configured by a slit 41 that extends linearly in the width direction of the connecting member 13 (second direction intersecting the first direction). The slit 41 extends to the center portion of the base member 32 in the width direction so as not to reach both ends of the base member 32 in the width direction. That is, in the thinned portion K, the central portion of the base member 32 is divided by the slit 41, and the base member 32 is connected only at both ends in the width direction. In FIG. 4, the position of the slit 41 in the longitudinal direction of the base member 32 is the midpoint position between the fastening portions 14, 14, but this position is an arbitrary position between the fastening portions 14, 14. It may be.

以上のように、電池パック１に適用されたハーネス接続構造１１では、締結部１４Ｂの位置に応じて貫通孔３１ｂが設けられたバスバー部材３１と、締結部１４Ｂの位置に応じてボルト３３が予め溶接され、貫通孔３１ｂにボルト３３を通した状態でバスバー部材３１に結合されたベース部材３２とによって連結部材１３が構成されている。このように、ボルト３３を予め溶接で固定したベース部材３２を用いることで、バスバー部材にボルトを一つずつ取り付ける場合に比べてハーネス接続構造１１の組立容易性を良好に確保できる。   As described above, in the harness connection structure 11 applied to the battery pack 1, the bus bar member 31 provided with the through hole 31b according to the position of the fastening portion 14B and the bolt 33 according to the position of the fastening portion 14B are previously provided. The connecting member 13 is constituted by the base member 32 which is welded and coupled to the bus bar member 31 with the bolt 33 passing through the through hole 31b. Thus, by using the base member 32 to which the bolts 33 are fixed in advance by welding, the ease of assembling the harness connection structure 11 can be ensured better than when the bolts are attached to the bus bar member one by one.

また、ハーネス接続構造１１では、バスバー部材３１が通電性の観点から銅で形成されているのに対し、ベース部材３２がボルト３３を溶接で固定する観点から鉄で形成されており、ベース部材３２がバスバー部材３１よりも熱膨張率の小さい材料によって形成されている。このため、通電等によって連結部材１３の温度が上昇した場合、バスバー部材３１がベース部材３２よりも大きく連結部材１３の長手方向に膨張し、締結部１４にすべり荷重が生じることが考えられる。締結部１４にすべり荷重が生じると、ナット３４の緩みなどに起因するハーネスＨの接続不良が生じるおそれがある。   In the harness connection structure 11, the bus bar member 31 is formed of copper from the viewpoint of electrical conductivity, whereas the base member 32 is formed of iron from the viewpoint of fixing the bolt 33 by welding. Is formed of a material having a smaller coefficient of thermal expansion than the bus bar member 31. For this reason, when the temperature of the connecting member 13 rises due to energization or the like, the bus bar member 31 may expand larger than the base member 32 in the longitudinal direction of the connecting member 13, and a sliding load may be generated in the fastening portion 14. If a sliding load is generated in the fastening portion 14, there is a possibility that a connection failure of the harness H due to loosening of the nut 34 or the like may occur.

これに対し、ハーネス接続構造１１では、ベース部材３２において、締結部１４，１４間に減肉部Ｋが設けられている。かかる減肉部Ｋを設けることで、荷重に対するベース部材３２の変形容易性が高められる。このため、ベース部材３２の熱膨張率がバスバー部材３１の熱膨張率より小さい場合でも、連結部材１３の温度が上昇した場合のバスバー部材３１の膨張に対するベース部材３２の膨張の追従性を確保できる。したがって、締結部１４でのすべり荷重を低減でき、ナット３４の緩みなどに起因するハーネスＨの接続不良の発生を抑制できる。   On the other hand, in the harness connection structure 11, the base member 32 is provided with a thinned portion K between the fastening portions 14 and 14. By providing the thinned portion K, the ease of deformation of the base member 32 with respect to the load is enhanced. For this reason, even when the thermal expansion coefficient of the base member 32 is smaller than the thermal expansion coefficient of the bus bar member 31, it is possible to ensure the followability of the expansion of the base member 32 to the expansion of the bus bar member 31 when the temperature of the connecting member 13 rises. . Therefore, the sliding load at the fastening portion 14 can be reduced, and occurrence of poor connection of the harness H due to loosening of the nut 34 can be suppressed.

また、ハーネス接続構造１１では、減肉部Ｋが連結部材１３の幅方向に形成されたスリット４１によって構成されている。このようなスリット４１により、減肉部Ｋにおいてベース部材３２の断面積が十分に小さくなる。これにより、連結部材１３の温度上昇時に減肉部Ｋに応力が集中し、荷重に対するベース部材３２の変形容易性がより確実に高められる。   Further, in the harness connection structure 11, the thinned portion K is configured by a slit 41 formed in the width direction of the connecting member 13. Such a slit 41 sufficiently reduces the cross-sectional area of the base member 32 in the thinned portion K. Thereby, stress concentrates on the thinned portion K when the temperature of the connecting member 13 rises, and the ease of deformation of the base member 32 with respect to the load is more reliably increased.

図５は、減肉部の変形例を示す要部拡大平面図である。図５（ａ）に示す例では、減肉部Ｋは、ベース部材３２における幅方向の一縁部３２ａに到達する第１のスリット５１Ａと、ベース部材３２における幅方向の他縁部３２ｂに到達する第２のスリット５１Ｂと、を有し、第１のスリット５１Ａと第２のスリット５１Ｂとが各締結部１４，１４間で互い違いとなるように設けられている。   FIG. 5 is an enlarged plan view of a main part showing a modification of the thinned portion. In the example shown in FIG. 5A, the thinned portion K reaches the first slit 51 </ b> A that reaches one edge portion 32 a in the width direction of the base member 32 and the other edge portion 32 b in the width direction of the base member 32. The first slit 51A and the second slit 51B are provided so as to alternate between the fastening portions 14 and 14.

このような構成によれば、ベース部材３２における幅方向の一縁部３２ａ及び他縁部３２ｂから切り込みを入れることで第１のスリット５１Ａ及び第２のスリット５１Ｂを容易に形成できる。また、第１のスリット５１Ａと第２のスリット５１Ｂとを各締結部１４，１４間で互い違いとすることで、隣り合う減肉部Ｋ，Ｋにかかる応力の向きが互い違いになるので、連結部材１３の温度上昇の際にベース部材３２が幅方向に歪んで変形することを防止できる。   According to such a configuration, the first slit 51 </ b> A and the second slit 51 </ b> B can be easily formed by cutting from the one edge part 32 a and the other edge part 32 b in the width direction of the base member 32. Further, since the first slit 51A and the second slit 51B are staggered between the fastening portions 14 and 14, the directions of the stress applied to the adjacent thinned portions K and K are staggered, so that the connecting member It is possible to prevent the base member 32 from being distorted and deformed in the width direction when the temperature rises by 13.

また、図５（ｂ）に示す例では、減肉部Ｋは、連結部材１３の幅方向に形成された切欠きによって構成されている。より具体的には、切欠きは、ベース部材３２における幅方向の一縁部３２ａに形成された第１の切欠き５２Ａと、ベース部材３２における幅方向の他縁部３２ｂに形成された第２の切欠き５２Ｂとからなる。第１の切欠き５２Ａ及び第２の切欠き５２Ｂは、いずれもベース部材３２における幅方向の中央側にむかって先鋭となる三角形状をなし、ベース部材３２における幅方向で互いに対向した状態となっている。   Further, in the example shown in FIG. 5B, the thinned portion K is configured by a notch formed in the width direction of the connecting member 13. More specifically, the notch includes a first notch 52A formed at one edge 32a in the width direction of the base member 32 and a second notch formed at the other edge 32b in the width direction of the base member 32. And a notch 52B. Each of the first notch 52A and the second notch 52B has a triangular shape that sharpens toward the center in the width direction of the base member 32, and is in a state of facing each other in the width direction of the base member 32. ing.

このような構成においても、ベース部材３２における幅方向の一縁部３２ａ及び他縁部３２ｂから切り込みを入れることで第１の切欠き５２Ａ及び第２の切欠き５２Ｂを容易に形成できる。また、第１の切欠き５２Ａと第２の切欠き５２Ｂとを互いに対向する位置とすることで、減肉部Ｋにかかる応力が幅方向で均一化されるので、連結部材１３の温度上昇の際にベース部材３２が幅方向に歪んで変形することを防止できる。   Even in such a configuration, the first notch 52A and the second notch 52B can be easily formed by making a cut from one edge 32a and the other edge 32b in the width direction of the base member 32. In addition, since the first notch 52A and the second notch 52B are positioned to face each other, the stress applied to the thinned portion K is made uniform in the width direction. At this time, it is possible to prevent the base member 32 from being distorted and deformed in the width direction.

図５（ｃ）に示す例のように、第１の切欠き５３Ａと第２の切欠き５３Ｂの形状は、矩形状であってもよい。この場合も、図５（ｂ）と同様の作用効果が得られる。また、減肉部Ｋにおいてベース部材３２が十分に減肉するので、荷重に対するベース部材３２の変形容易性が十分に高められる。   As in the example shown in FIG. 5C, the first notch 53A and the second notch 53B may have a rectangular shape. Also in this case, the same effect as in FIG. 5B can be obtained. Further, since the base member 32 is sufficiently thinned at the thinned portion K, the ease of deformation of the base member 32 with respect to the load is sufficiently enhanced.

図６は、減肉部の別の変形例を示す要部拡大平面図である。図６（ａ）に示す例では、減肉部Ｋは、連結部材１３の幅方向に延在する凹部６１によって構成されている。凹部６１は、例えば断面半円形状をなし、ベース部材３２における幅方向の一縁部３２ａから他縁部３２ｂにわたって連続した状態となっている。このような構成によれば、凹部６１によって減肉部Ｋを容易に形成できる。凹部６１の断面形状は、断面半円形状に限られず、断面矩形状や断面三角形状などの種々の形状を採り得る。凹部６１の本数も１本に限られず、複数本としてもよい。   FIG. 6 is a main part enlarged plan view showing another modification of the thinned portion. In the example shown in FIG. 6A, the thinned portion K is constituted by a recess 61 that extends in the width direction of the connecting member 13. The recess 61 has, for example, a semicircular cross section, and is continuous from the one edge 32a in the width direction of the base member 32 to the other edge 32b. According to such a configuration, the thinned portion K can be easily formed by the recess 61. The cross-sectional shape of the recess 61 is not limited to the semicircular cross-sectional shape, and may take various shapes such as a rectangular cross-sectional shape and a triangular cross-sectional shape. The number of the recesses 61 is not limited to one and may be a plurality.

図６（ｂ）に示す例では、減肉部Ｋは、複数の窪み部６２によって構成されている。窪み部６２は、例えば半球状をなし、互いに所定の間隔をもって形成されている。このような構成においても、窪み部６２によって減肉部Ｋを容易に形成できる。窪み部６２の断面形状は、半球状に限られず、矩形状や錘状などの種々の形状を採り得る。窪み部６２の径や密度などもベース部材３２の変形容易性の要求に応じて適宜変更してもよい。   In the example shown in FIG. 6B, the thinned portion K is configured by a plurality of recessed portions 62. The depressions 62 are, for example, hemispherical and are formed at a predetermined interval from each other. Even in such a configuration, the thinned portion K can be easily formed by the recessed portion 62. The cross-sectional shape of the recessed portion 62 is not limited to a hemispherical shape, and may take various shapes such as a rectangular shape and a weight shape. The diameter and density of the recess 62 may be changed as appropriate according to the requirements for ease of deformation of the base member 32.

なお、上述したベース部材３２は、組み付け作業性の観点から、バスバー部材３１への組み付け前には減肉部Ｋが切断されない程度の強度を要するが、組み付け後には減肉部Ｋが切断されてもよい。組み付け後に減肉部Ｋが切断されたとしても、ハーネスＨと連結部材１３との電気的な接続は、バスバー部材３１によって維持される一方、切断されたベース部材３２同士は、温度上昇時のバスバー部材３１の膨張に対してフリーになる。減肉部Ｋでのベース部材３２の切断は、バスバー部材３１をベース部材３２に組み付ける際に意図せずに生じることもあるが、減肉部Ｋでベース部材３２を切断する切断工程を積極的に実施してもよい。   In addition, from the viewpoint of assembling workability, the above-described base member 32 requires strength that the thinned portion K is not cut before assembling to the bus bar member 31, but the thinned portion K is cut after assembling. Also good. Even if the thinned portion K is cut after assembly, the electrical connection between the harness H and the connecting member 13 is maintained by the bus bar member 31, while the cut base members 32 are connected to the bus bar when the temperature rises. It becomes free with respect to the expansion of the member 31. The cutting of the base member 32 at the thinned portion K may occur unintentionally when the bus bar member 31 is assembled to the base member 32, but the cutting process of cutting the base member 32 at the thinned portion K is positive. May be implemented.

１…電池パック、３…電池モジュール、１１…ハーネス接続構造、１２…端子台、１３…連結部材、１４（１４Ａ，１４Ｂ）…締結部、２２…インサートボルト、２３，３４…ナット、３１…バスバー部材、３１ｂ…貫通孔、３２…ベース部材、３２ａ…一縁部、３２ｂ…他縁部、３３…ボルト、４１…スリット、５１Ａ…第１のスリット、５１Ｂ…第２のスリット、５２Ａ，５３Ａ…第１の切欠き、５２Ａ，５３Ｂ…第２の切欠き、６１…凹部、６２…窪み部、Ｈ…ハーネス、Ｈａ…接続端子、Ｋ…減肉部。   DESCRIPTION OF SYMBOLS 1 ... Battery pack, 3 ... Battery module, 11 ... Harness connection structure, 12 ... Terminal block, 13 ... Connecting member, 14 (14A, 14B) ... Fastening part, 22 ... Insert bolt, 23, 34 ... Nut, 31 ... Busbar Member, 31b ... through hole, 32 ... base member, 32a ... one edge, 32b ... other edge, 33 ... bolt, 41 ... slit, 51A ... first slit, 51B ... second slit, 52A, 53A ... 1st notch, 52A, 53B ... 2nd notch, 61 ... recessed part, 62 ... recessed part, H ... harness, Ha ... connection terminal, K ... thinning part.

Claims (8)

所定の間隔をもって配置された端子台と、
前記端子台間を連結する連結部材と、
前記連結部材に設けられた複数の締結部と、を備え、
前記連結部材は、
前記締結部の位置に応じて貫通孔が設けられたバスバー部材と、
前記締結部の位置に応じてボルトが固定され、前記貫通孔に前記ボルトを通した状態で前記バスバー部材に結合されたベース部材と、を有し、
前記ベース部材は、前記バスバー部材に比べて熱膨張率の小さい材料によって形成され、前記締結部間に減肉部が設けられているハーネス接続構造。 A terminal block arranged at a predetermined interval;
A connecting member for connecting the terminal blocks;
A plurality of fastening portions provided on the connecting member,
The connecting member is
A bus bar member provided with a through hole according to the position of the fastening portion;
A bolt fixed according to the position of the fastening portion, and a base member coupled to the bus bar member in a state in which the bolt is passed through the through hole,
The base member is formed of a material having a smaller coefficient of thermal expansion than the bus bar member, and a harness connection structure in which a thinned portion is provided between the fastening portions. 前記締結部は、前記ベース部材に固定された前記ボルトにナットを螺合して構成される締結部と、前記端子台に設けられたボルトにナットを螺合して構成される締結部とを有している請求項１記載のハーネス接続構造。   The fastening portion includes: a fastening portion configured by screwing a nut to the bolt fixed to the base member; and a fastening portion configured by screwing a nut to the bolt provided on the terminal block. The harness connection structure according to claim 1. 前記減肉部は、前記締結部間を結ぶ第１の方向と交差する第２の方向に形成されたスリットである請求項１又は２記載のハーネス接続構造。   The harness connection structure according to claim 1 or 2, wherein the thinned portion is a slit formed in a second direction intersecting with a first direction connecting the fastening portions. 前記スリットは、
前記ベース部材における前記第２の方向の一縁部に到達する第１のスリットと、
前記ベース部材における前記第２の方向の他縁部に到達する第２のスリットと、を有し、
前記第１のスリットと前記第２のスリットとが前記各締結部間で互い違いとなるように設けられている請求項３記載のハーネス接続構造。 The slit is
A first slit that reaches one edge of the second direction in the base member;
A second slit that reaches the other edge of the base member in the second direction,
The harness connection structure according to claim 3, wherein the first slit and the second slit are provided so as to alternate between the fastening portions. 前記減肉部は、前記締結部間を結ぶ第１の方向と交差する第２の方向に形成された切欠きであり、
前記ベース部材における前記第２の方向の一縁部に形成された第１の切欠きと、前記ベース部材における前記第２の方向の他縁部に形成された第２の切欠きとが互いに対向するように設けられている請求項１又は２記載のハーネス接続構造。 The thinned portion is a notch formed in a second direction intersecting with a first direction connecting the fastening portions,
A first notch formed at one edge of the base member in the second direction and a second notch formed at the other edge of the base member in the second direction are opposed to each other. The harness connection structure according to claim 1, wherein the harness connection structure is provided. 前記減肉部は、前記締結部間を結ぶ第１の方向と交差する第２の方向に延在する凹部である請求項１又は２記載のハーネス接続構造。   The harness connection structure according to claim 1 or 2, wherein the thinned portion is a recess extending in a second direction intersecting a first direction connecting the fastening portions. 前記減肉部は、複数の窪み部である請求項１又は２記載のハーネス接続構造。   The harness connection structure according to claim 1, wherein the thinned portion is a plurality of recessed portions. 複数の電池セルを配列してなる電池モジュールと、請求項１〜７のいずれか一項記載のハーネス接続構造と、を筐体内に配置してなる電池パック。   A battery pack in which a battery module formed by arranging a plurality of battery cells and the harness connection structure according to claim 1 are arranged in a housing.
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JPS61133973U (en) * 1985-02-12 1986-08-21
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JP2023003942A (en) * 2021-06-25 2023-01-17 森村Ｓｏｆｃテクノロジー株式会社 Electrochemical reaction cell stack
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