JP6921630B2 - Rechargeable battery module - Google Patents

Rechargeable battery module Download PDF

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JP6921630B2
JP6921630B2 JP2017112197A JP2017112197A JP6921630B2 JP 6921630 B2 JP6921630 B2 JP 6921630B2 JP 2017112197 A JP2017112197 A JP 2017112197A JP 2017112197 A JP2017112197 A JP 2017112197A JP 6921630 B2 JP6921630 B2 JP 6921630B2
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battery
housing
battery module
lashing
secondary battery
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JP2018206654A (en
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航 佐藤
航 佐藤
拓是 森川
拓是 森川
茂樹 牧野
茂樹 牧野
将成 織田
将成 織田
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Vehicle Energy Japan Inc
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Vehicle Energy Japan Inc
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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
    • H01M50/204—Racks, modules or packs for multiple batteries or multiple cells
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/61—Types of temperature control
    • H01M10/613—Cooling or keeping cold
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/61—Types of temperature control
    • H01M10/617—Types of temperature control for achieving uniformity or desired distribution of temperature
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/62—Heating or cooling; Temperature control specially adapted for specific applications
    • H01M10/625—Vehicles
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/64—Heating or cooling; Temperature control characterised by the shape of the cells
    • H01M10/647—Prismatic or flat cells, e.g. pouch cells
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/65—Means for temperature control structurally associated with the cells
    • H01M10/651—Means for temperature control structurally associated with the cells characterised by parameters specified by a numeric value or mathematical formula, e.g. ratios, sizes or concentrations
    • H01M10/652—Means for temperature control structurally associated with the cells characterised by parameters specified by a numeric value or mathematical formula, e.g. ratios, sizes or concentrations characterised by gradients
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/65—Means for temperature control structurally associated with the cells
    • H01M10/653—Means for temperature control structurally associated with the cells characterised by electrically insulating or thermally conductive materials
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/65—Means for temperature control structurally associated with the cells
    • H01M10/655—Solid structures for heat exchange or heat conduction
    • H01M10/6554—Rods or plates
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/65—Means for temperature control structurally associated with the cells
    • H01M10/656—Means for temperature control structurally associated with the cells characterised by the type of heat-exchange fluid
    • H01M10/6561—Gases
    • H01M10/6563—Gases with forced flow, e.g. by blowers
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/65—Means for temperature control structurally associated with the cells
    • H01M10/656—Means for temperature control structurally associated with the cells characterised by the type of heat-exchange fluid
    • H01M10/6567—Liquids
    • 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
    • H01M50/264—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders with fastening means, e.g. locks for cells or batteries, e.g. straps, tie rods or peripheral frames
    • 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)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Physics & Mathematics (AREA)
  • Algebra (AREA)
  • General Physics & Mathematics (AREA)
  • Mathematical Analysis (AREA)
  • Mathematical Optimization (AREA)
  • Pure & Applied Mathematics (AREA)
  • Battery Mounting, Suspending (AREA)
  • Secondary Cells (AREA)

Description

本発明は、二次電池モジュールに関する。 The present invention relates to a secondary battery module.

近年、環境規制を背景に車載用二次電池への需要が高まっている。この中で、リチウムイオン二次電池は一般に、鉛電池やニッケル水素電池などに比べて放電電位が高いため、小型・高エネルギー密度化が可能であるため有望視されている。しかし、電池から大電流を入・出力させる場合、電池の内部抵抗に由来する発熱が電池内部で生じ、電池温度が上昇する。電池温度が高い状態が続くと、電池の劣化が早まり、特性が低下する恐れがある。そのため、電池の温度上昇を抑制する技術が求められている。これらの課題に対して、電池の温度上昇を抑制するため、電池で生じた熱を電池モジュールのケースに伝える熱伝導部材を設ける構造を持つ電池モジュールが特許文献１に記載されており、特許文献１には「各単電池の熱をトレイに伝導し、このトレイをケース内壁側面に圧接して、各単電池の熱をケースに伝導し、各単電池の熱をケースの外壁から大気に放熱する」と記載されている。また、接触熱抵抗を低減させる構造として特許文献２には「各電池間に楔形のスペーサをその先端が内側に位置するようにそれぞれ設け、各スペーサを内側に向かって押圧する」と記載されている。 In recent years, the demand for in-vehicle secondary batteries has been increasing against the background of environmental regulations. Among these, lithium-ion secondary batteries are generally considered to be promising because they have a higher discharge potential than lead batteries, nickel-metal hydride batteries, and the like, and therefore can be made smaller and have higher energy densities. However, when a large current is input / output from the battery, heat generated due to the internal resistance of the battery is generated inside the battery, and the battery temperature rises. If the battery temperature continues to be high, the battery may deteriorate faster and its characteristics may deteriorate. Therefore, there is a demand for a technique for suppressing the temperature rise of the battery. To solve these problems, Patent Document 1 describes a battery module having a structure provided with a heat conductive member that transfers heat generated by the battery to the case of the battery module in order to suppress the temperature rise of the battery. In 1, "The heat of each cell is conducted to the tray, this tray is pressed against the side surface of the inner wall of the case, the heat of each cell is conducted to the case, and the heat of each cell is dissipated to the atmosphere from the outer wall of the case. I will do it. " Further, as a structure for reducing contact thermal resistance, Patent Document 2 describes that "a wedge-shaped spacer is provided between each battery so that its tip is located inside, and each spacer is pressed inward." There is.

特開２００６−３３９０３２号公報Japanese Unexamined Patent Publication No. 2006-339032. 特開２００８−２９３６６２号公報Japanese Unexamined Patent Publication No. 2008-293662

前記特許文献１で示される構造は、各電池の間にトレイを設け、電池で生じた熱をトレイに伝導し、トレイを介してケースに伝導することで、電池の温度上昇を抑制する。しかし、特許文献１に記載された構造では、トレイとケースの接触熱抵抗が大きい場合、電池温度を効率的に低減できないという課題があった。前記特許文献２には、電池間に楔形のスペーサを設けることで、電池とスペーサの接触が一様になり、効率的に放熱できる構造が示されている。しかし、特許文献２に記載された構造では、電池と電池の間にスペーサを設けており、スペーサを介した放熱となるため、スペーサの熱抵抗が冷却の効果を低下させるという課題があった。 In the structure shown in Patent Document 1, a tray is provided between each battery, heat generated by the battery is conducted to the tray, and the heat is conducted to the case through the tray, thereby suppressing the temperature rise of the battery. However, the structure described in Patent Document 1 has a problem that the battery temperature cannot be efficiently reduced when the contact thermal resistance between the tray and the case is large. Patent Document 2 discloses a structure in which a wedge-shaped spacer is provided between batteries so that the contact between the battery and the spacer becomes uniform and heat can be efficiently dissipated. However, in the structure described in Patent Document 2, a spacer is provided between the batteries, and heat is dissipated through the spacer, so that there is a problem that the thermal resistance of the spacer reduces the cooling effect.

本発明は、このような課題を解決するためになされたものであり、複数の電池をモジュール筐体の側壁に押圧することで電池と筐体の間の接触熱抵抗を低減し、電池の温度上昇を効率的に抑制することで、信頼性の高い二次電池モジュールを提供することにある。 The present invention has been made to solve such a problem, and by pressing a plurality of batteries against the side wall of the module housing, the contact thermal resistance between the batteries and the housing is reduced, and the temperature of the batteries is reduced. The purpose is to provide a highly reliable secondary battery module by efficiently suppressing the rise.

上記課題を解決するための代表的な本発明の二次電池モジュールの一つは、複数の電池から成る電池群を固縛する固縛部材において、固縛部材は電池の底面方向に押圧する押圧部を有し、電池の底面を二次電池モジュールの筐体に一様に押圧することにより達成される。 One of the typical secondary battery modules of the present invention for solving the above problems is a lashing member for lashing a battery group composed of a plurality of batteries, and the lashing member presses the battery toward the bottom surface. This is achieved by having a portion and uniformly pressing the bottom surface of the battery against the housing of the secondary battery module.

本発明に係る二次電池モジュールは、電池を二次電池モジュールの筐体に密着させることで、電池とモジュールの筐体の間の接触熱抵抗を低減し、電池の温度上昇を抑制できる。さらに、複数の電池を筐体に一様に接触させることができるため、複数の電池間の温度差を小さく抑えることができる。 In the secondary battery module according to the present invention, the contact thermal resistance between the battery and the housing of the module can be reduced and the temperature rise of the battery can be suppressed by bringing the battery into close contact with the housing of the secondary battery module. Further, since the plurality of batteries can be uniformly brought into contact with the housing, the temperature difference between the plurality of batteries can be suppressed to be small.

上記以外の課題、構成及び効果は、以下の実施形態の説明により明らかにされる。 Issues, configurations and effects other than the above will be clarified by the following description of the embodiments.

電池の外観図External view of the battery 本発明の二次電池モジュールの実施例１の断面斜視図Cross-sectional perspective view of Example 1 of the secondary battery module of the present invention 実施例１を説明する断面図Sectional drawing which explains Example 1. 実施例１の効果を示す比較図Comparative diagram showing the effect of Example 1 実施例２を説明する断面図Sectional drawing explaining Example 2 実施例３を示す断面図Sectional drawing which shows Example 3. 実施例４を示す断面図Sectional drawing which shows Example 4 実施例５を示す断面図Sectional drawing which shows Example 5.

以下、本発明について説明する。 Hereinafter, the present invention will be described.

《実施例１》
図１は電池４の外観図である。本発明において、説明のため電池４の各側面はそれぞれ底面４ａ、１対の長尺側面４ｂ、１対の短尺側面４ｃとし、電極端子５が配置される面を上面４ｄと示す。 << Example 1 >>
FIG. 1 is an external view of the battery 4. In the present invention, each side surface of the battery 4 is referred to as a bottom surface 4a, a pair of long side surfaces 4b, and a pair of short side surfaces 4c, respectively, and a surface on which the electrode terminals 5 are arranged is referred to as a top surface 4d.

図２は本発明の実施例１の形態に係る二次電池モジュール１において、電池４を積層させた電池群１２と制御装置１１（図示せず）の間で筐体２を破断し、電池群１２を有する筐体２の断面斜視図である。なお、本出願では説明の便宜上、図２左下の方向を用いて各図面の説明をすることとする。 FIG. 2 shows, in the secondary battery module 1 according to the embodiment of the first embodiment of the present invention, the housing 2 is broken between the battery group 12 in which the batteries 4 are stacked and the control device 11 (not shown), and the battery group is shown. 12 is a cross-sectional perspective view of the housing 2 having 12. In this application, for convenience of explanation, each drawing will be described using the direction at the lower left of FIG.

図３は二次電池モジュール１において、図２のＡ−Ａ’断面を上面から見た断面図である。ただし、制御装置１１を含む二次電池モジュール１の断面とした。 FIG. 3 is a cross-sectional view of the secondary battery module 1 as seen from above the AA'cross section of FIG. However, the cross section of the secondary battery module 1 including the control device 11 is used.

図２に示すように、二次電池モジュール１は、複数の電池４の長尺側面４ｂを互いに対向させるように積層させた電池群１２ａ、１２ｂと、電池群１２ａ、１２ｂをそれぞれ電池４の短尺側面４ｃの方向へ固縛する第一の固縛部材６（６ａ１、６ａ２、６ｂ）と、電池群１２を長尺側面４ｂの方向、すなわち電池群１２の積層方向に押圧する第二の固縛部材１０（１０ａ、１０ｂ）と、電池の制御装置１１（図示せず）と、それらを収納する筐体２および筐体蓋３から構成される。筐体２は第一の側壁２ａ、第二の側壁２ｂ、第三の側壁２ｃ、底面２ｄを有する。 As shown in FIG. 2, in the secondary battery module 1, the battery groups 12a and 12b in which the long side surfaces 4b of the plurality of batteries 4 are laminated so as to face each other, and the battery groups 12a and 12b are short in battery 4, respectively. The first lashing member 6 (6a1, 6a2, 6b) that ties in the direction of the side surface 4c and the second lashing that presses the battery group 12 in the direction of the long side surface 4b, that is, in the stacking direction of the battery group 12. It is composed of members 10 (10a, 10b), a battery control device 11 (not shown), a housing 2 for accommodating them, and a housing lid 3. The housing 2 has a first side wall 2a, a second side wall 2b, a third side wall 2c, and a bottom surface 2d.

なお、第一の固縛部材６は、筐体２と電池群１２ａとの間、および筐体２と電池群１２ｂとの間にそれぞれ配置される固縛部材６ａ１、６ａ２と、電池群１２ａと電池群１２ｂとの間に配置される固縛部材６ｂとからなる。 The first lashing member 6 includes the lashing members 6a1 and 6a2 arranged between the housing 2 and the battery group 12a and between the housing 2 and the battery group 12b, respectively, and the battery group 12a. It is composed of a lashing member 6b arranged between the battery group 12b and the battery group 12b.

本実施例では、電池群１２ａと１２ｂの２組設け、筐体２と電池群１２の間および２組の電池群１２ａ、１２ｂの間に第一の固縛部材６（６ａ１、６ａ２、６ｂ）を設けた構造となっている。すなわち、第一の固縛部材６（６ａ１、６ａ２、６ｂ）によって、電池４は短尺側面４ｃの方向が固縛され、第一の固縛部材６（６ａ１、６ａ２、６ｂ）は第二の固縛部材１０（１０ａ、１０ｂ）とボルト（図示せず）によって固定しているため、第二の固縛部材１０（１０ａ、１０ｂ）によって長尺側面４ｂの方向が固縛されている。 In this embodiment, two sets of battery groups 12a and 12b are provided, and the first lashing member 6 (6a1, 6a2, 6b) is provided between the housing 2 and the battery group 12 and between the two sets of battery groups 12a and 12b. It has a structure provided with. That is, the first lashing member 6 (6a1, 6a2, 6b) ties the battery 4 in the direction of the short side surface 4c, and the first lashing member 6 (6a1, 6a2, 6b) is second lashing. Since it is fixed by the binding member 10 (10a, 10b) and a bolt (not shown), the direction of the long side surface 4b is fixed by the second binding member 10 (10a, 10b).

さらに図３に示すように、第一の固縛部材６（６ａ１、６ａ２、６ｂ）は筐体２にボルト８によって固定される。ここで、第一の固縛部材６（６ａ１、６ａ２、６ｂ）は、電池４の上面４ｄに近い面に電池缶側に飛び出す突起部６ａ３、６ａ４、６ｂ１を有する構造となっており、突起部６ａ３、６ａ４、６ｂ１によって電極群１２は電池４の底面４ａ方向に押圧される。 Further, as shown in FIG. 3, the first lashing member 6 (6a1, 6a2, 6b) is fixed to the housing 2 by bolts 8. Here, the first lashing member 6 (6a1, 6a2, 6b) has a structure having protrusions 6a3, 6a4, 6b1 protruding toward the battery can on a surface close to the upper surface 4d of the battery 4. The electrode group 12 is pressed by the 6a3, 6a4, and 6b1 in the direction of the bottom surface 4a of the battery 4.

すなわち、電池４の短尺側面４ｃ方向を固縛する第一の固縛部材６（６ａ１、６ａ２、６ｂ）によって、底面４ａ方向への固縛を同時に実現する。このとき、電池４の底面４ａと筐体２の第一の側壁２ａの間には可撓性を有する熱伝導部材９を設ける。この時、第一の固縛部材６の突起部６ａ（６ａ３、６ａ４）を除く部分であってボルト８によって押圧された状態の高さ（Ｈ１）は、電池４の高さ（Ｈ２）と押圧しない状態での熱伝導部材９の高さ（Ｈ３）の和より小さくなっている（Ｈ１＜Ｈ２＋Ｈ３）。 That is, the first lashing member 6 (6a1, 6a2, 6b) that ties the short side surface 4c direction of the battery 4 simultaneously realizes the lashing in the bottom surface 4a direction. At this time, a flexible heat conductive member 9 is provided between the bottom surface 4a of the battery 4 and the first side wall 2a of the housing 2. At this time, the height (H1) of the first lashing member 6 excluding the protrusions 6a (6a3, 6a4) and pressed by the bolt 8 is the height (H2) of the battery 4 and the pressing. It is smaller than the sum of the heights (H3) of the heat conductive member 9 in the non-existing state (H1 <H2 + H3).

この構造により、第一の固縛部材６（６ａ１、６ａ２、６ｂ）はボルト８によって筐体２の第一の側壁２ａに固定した際に、底面４ａが熱伝導部材９を介して筐体２の第一の側壁２ａに押圧する。そのため、固縛部材６を左右方向の固縛に使用するだけでなく、前後方向の固縛にも使用することができ、１つの固縛部材で前後、左右の二方向について固縛することができる。 With this structure, when the first lashing member 6 (6a1, 6a2, 6b) is fixed to the first side wall 2a of the housing 2 by the bolt 8, the bottom surface 4a is connected to the housing 2 via the heat conductive member 9. Press against the first side wall 2a of. Therefore, the lashing member 6 can be used not only for lashing in the left-right direction but also for lashing in the front-rear direction, and one lashing member can be used for lashing in two directions, front-back and left-right. can.

また、本発明では筐体２の第一の側壁２ａに押圧する機構を固縛部材６に単純な突起を設ける構造で実現したため、筐体２の第三の側壁２ｃと電池４の上面４ｄとの間（筐体２において電極群１２が固定される面とは逆側の筐体２の空間）に十分な空間を設けることができる。そのため特に二次電池モジュール１を大型化せずとも制御装置１１を筐体２に収納することができる。したがって電池モジュール１をコンパクトな構造にすることが可能となる。なお、制御装置１１は例えば回路基板、ジャンクションボックス、ヒューズ等で構成される。 Further, in the present invention, since the mechanism for pressing the first side wall 2a of the housing 2 is realized by the structure in which the lashing member 6 is provided with a simple protrusion, the third side wall 2c of the housing 2 and the upper surface 4d of the battery 4 are used. A sufficient space can be provided between the spaces (the space of the housing 2 on the side opposite to the surface on which the electrode group 12 is fixed in the housing 2). Therefore, the control device 11 can be housed in the housing 2 without particularly increasing the size of the secondary battery module 1. Therefore, the battery module 1 can have a compact structure. The control device 11 is composed of, for example, a circuit board, a junction box, a fuse, and the like.

上述した本実施の形態によれば、以下のような作用効果を奏することができる。 According to the above-described embodiment, the following effects can be obtained.

（１）電池４の温度上昇を抑制する
電池４で発生した熱は、筐体２に伝わり、筐体２の表面から周囲の空気へ放熱される。この時、第一の固縛部材６（６ａ１、６ａ２、６ｂ）によって、電池４が筐体２の第一の側壁２ａへ押圧されているため、電池４と熱伝導部材９の間の接触熱抵抗および熱伝導部材９と筐体２の第一の側壁２ａの間の接触熱抵抗が小さく抑えられる。すなわち、電池４の放熱経路である電池４から周囲空気の間の熱抵抗を低減することができ、電池４の温度上昇を効率的に抑制できる。 (1) Suppressing the temperature rise of the battery 4 The heat generated by the battery 4 is transferred to the housing 2 and dissipated from the surface of the housing 2 to the surrounding air. At this time, since the battery 4 is pressed against the first side wall 2a of the housing 2 by the first lashing member 6 (6a1, 6a2, 6b), the contact heat between the battery 4 and the heat conductive member 9 is generated. Resistance and contact thermal resistance between the heat conductive member 9 and the first side wall 2a of the housing 2 can be suppressed to a small value. That is, the thermal resistance between the battery 4 which is the heat dissipation path of the battery 4 and the ambient air can be reduced, and the temperature rise of the battery 4 can be efficiently suppressed.

（２）電池群１２における電池間の温度差を小さくする
複数の電池４と筐体２の第一の側壁２ａの間の接触熱抵抗が一様に低減されるため、各電池の放熱性能を均一にすることができ、各電池の温度上昇の差が小さくなる。 (2) Reducing the temperature difference between the batteries in the battery group 12 Since the contact thermal resistance between the plurality of batteries 4 and the first side wall 2a of the housing 2 is uniformly reduced, the heat dissipation performance of each battery is improved. It can be made uniform, and the difference in temperature rise of each battery becomes small.

図４は二次電池モジュール１を周囲温度２５℃の環境中に配置し、電池４の発熱量を３．１ Ｗとしたときの、電池４の温度計算結果を示す。ここでは、実施例１の構造を有する２次電池モジュール１における電池群１２の温度と、比較構造として、第一の固縛部材６に押圧部６ａを設けず、電池４を筐体２に押圧していない構造における電池群１２の温度上昇を比較した。ここでは、比較構造の電池群１２の最下段に配置した電池Ｎｏ１の温度上昇を１００としたときの各電池の温度上昇の比を示した。いずれの構造においても、電池Ｎｏ１の温度が最も低く、電池Ｎｏ４の温度が最も高い結果となった。表１は各構造における電池Ｎｏ１の温度上昇と、電池Ｎｏ４の温度上昇の比較を示す。 FIG. 4 shows the temperature calculation result of the battery 4 when the secondary battery module 1 is placed in an environment having an ambient temperature of 25 ° C. and the calorific value of the battery 4 is 3.1 W. Here, as a comparative structure, the temperature of the battery group 12 in the secondary battery module 1 having the structure of the first embodiment is compared, and the battery 4 is pressed against the housing 2 without providing the pressing portion 6a on the first lashing member 6. The temperature rise of the battery group 12 in the non-structured structure was compared. Here, the ratio of the temperature rise of each battery when the temperature rise of the battery No. 1 arranged at the bottom of the battery group 12 of the comparative structure is set to 100 is shown. In any of the structures, the temperature of the battery No. 1 was the lowest and the temperature of the battery No. 4 was the highest. Table 1 shows a comparison between the temperature rise of the battery No. 1 and the temperature rise of the battery No. 4 in each structure.

Figure 0006921630
Figure 0006921630

電池Ｎｏ４の温度は比較構造では電池Ｎｏ１に対して１７．９％温度上昇が大きくなった。これに対し、実施例１では最も温度上昇が大きかった電池Ｎｏ４でも−７．２ ％となり、電池群１２の温度上昇を小さくできることを確認した。 In the comparative structure, the temperature of the battery No. 4 increased by 17.9% with respect to the battery No. 1. On the other hand, in Example 1, even the battery No. 4 having the largest temperature rise was −7.2%, confirming that the temperature rise of the battery group 12 could be reduced.

このように、電池４の底面４ａを筐体２の第一の側壁２ａに押圧することにより、電池４の温度上昇が小さくなる。これにより、電池性能の劣化を抑制し、信頼性の高い二次電池モジュール１を提供できる。 By pressing the bottom surface 4a of the battery 4 against the first side wall 2a of the housing 2 in this way, the temperature rise of the battery 4 becomes small. As a result, deterioration of battery performance can be suppressed, and a highly reliable secondary battery module 1 can be provided.

（３）二次電池モジュール１の実装密度の低下を抑制
本発明では固縛部材６（６ａ１、６ａ２、６ｂ）に簡単な突起を設けるだけで、電池４を筐体２の第一の側壁２ａに押圧することが可能となる。電池４の温度上昇を抑制するために新たな大型の部材を導入することないため、二次電池モジュール１の実装密度の低下が抑制される。 (3) Suppressing a decrease in the mounting density of the secondary battery module 1 In the present invention, the battery 4 can be mounted on the first side wall 2a of the housing 2 by simply providing a simple protrusion on the lashing member 6 (6a1, 6a2, 6b). It becomes possible to press on. Since a new large member is not introduced to suppress the temperature rise of the battery 4, the decrease in the mounting density of the secondary battery module 1 is suppressed.

本実施例では、筐体２に電池４を６個積層させた電池群１２を２組配置した例を示したが、電池４の積層数および配置組数は限定されるものではない。 In this embodiment, an example is shown in which two sets of battery groups 12 in which six batteries 4 are stacked are arranged in the housing 2, but the number of layers of the batteries 4 and the number of arranged sets are not limited.

さらに二次電池モジュール１の冷却性能を向上させるため、例えば電池４の底面４ａを固定した筐体２の第一の側壁２ａにヒートシンクを固定することで、電池４の温度上昇を効率的に抑制することができる。ただし、冷却構造を固定する位置は第一の側壁２ａに限らない。また冷却構造はヒートシンクに限らず、ファンを取り付けた空冷構造、水冷構造を固定してもよい。 Further, in order to improve the cooling performance of the secondary battery module 1, for example, by fixing the heat sink to the first side wall 2a of the housing 2 to which the bottom surface 4a of the battery 4 is fixed, the temperature rise of the battery 4 is efficiently suppressed. can do. However, the position where the cooling structure is fixed is not limited to the first side wall 2a. The cooling structure is not limited to the heat sink, and an air-cooled structure or a water-cooled structure to which a fan is attached may be fixed.

また、第一の固縛部材６は熱伝導率の高い金属材料であることが好ましく、たとえばアルミニウムや銅で形成するとよい。ただし、同一の材質である必要はなく、押圧部６ａのみ絶縁性の高い部材、たとえば樹脂材料で構築してもよい。さらに、第一の固縛部材６と電池４の間に熱伝導性を有する絶縁材を設けることで、絶縁性を高めてもよい。 Further, the first lashing member 6 is preferably made of a metal material having high thermal conductivity, and is preferably formed of, for example, aluminum or copper. However, it does not have to be the same material, and only the pressing portion 6a may be constructed of a member having high insulating properties, for example, a resin material. Further, the insulating property may be enhanced by providing an insulating material having thermal conductivity between the first lashing member 6 and the battery 4.

本実施形態の構成について簡単にまとめる。 The configuration of this embodiment will be briefly summarized.

本実施形態に記載の電池モジュール（１）は、一対の第一の側面（４ｂ）と、一対の第二の側面（４ｃ）と、前記第一及び第二の側面と繋がる底面（４ａ）を有する二次電池（４）を、第一の側面（４ｂ）同士が対向するように積層された電池群（１２ａ、１２ｂ）と、電池群（１２ａ、１２ｂ）を構成する二次電池（１）の第二の側面（４ｃ）と接続され、当該第二の側面方向に押圧する固縛部材（６）と、電池群（１２ａ、１２ｂ）及び固縛部材（６）を収納し、二次電池（４）の底面（４ａ）と直接的又は間接的に密着する筐体（３）と、を備えた電池モジュール（１）において、固縛部材（６）は、電池群（１２ａ、１２ｂ）を構成する二次電池の底面方向に押圧する押圧部（６ａ３、６ａ４、６ｂ１）を有することを特徴とする。 The battery module (1) according to the present embodiment has a pair of first side surfaces (4b), a pair of second side surfaces (4c), and a bottom surface (4a) connected to the first and second side surfaces. A secondary battery (1) constituting a battery group (12a, 12b) in which the primary side surfaces (4b) of the secondary battery (4) are stacked so as to face each other, and a battery group (12a, 12b). A secondary battery that is connected to the second side surface (4c) of the above and houses the lashing member (6) that presses in the direction of the second side surface, the battery groups (12a, 12b), and the lashing member (6). In the battery module (1) including the housing (3) which is in direct or indirect contact with the bottom surface (4a) of (4), the lashing member (6) is a battery group (12a, 12b). It is characterized by having a pressing portion (6a3, 6a4, 6b1) that presses toward the bottom surface of the constituent secondary battery.

このような構造にすることによって、左右方向の固縛に使用していた固縛部材６ａ１、６ａ２、６ｂ１を前後方向の固縛にも使用することが可能となり、二次電池モジュール１の冷却効率を向上することが可能となる。 With such a structure, the lashing members 6a1, 6a2, 6b1 used for lashing in the left-right direction can also be used for lashing in the front-rear direction, and the cooling efficiency of the secondary battery module 1 can be increased. Can be improved.

また、本発明では固縛部材６ａ１、６ａ２、６ｂ１を左右方向、前後方向へ熱を逃がすための放熱部材として使用している。つまり一つの部材の機能を共通化することによって、新たな機能を有する部材を追加することなく、冷却性能を向上させることを実現している。 Further, in the present invention, the lashing members 6a1, 6a2, 6b1 are used as heat radiating members for releasing heat in the left-right direction and the front-rear direction. That is, by sharing the functions of one member, it is possible to improve the cooling performance without adding a member having a new function.

また、本発明の電池モジュール（１）は、押圧部（６ａ３、６ａ４、６ｂ１）が、固縛部材から延びる突起部になっている。つまり、押圧部（６ａ３、６ａ４、６ｂ１）を簡易な構造とすることによって、固縛部材（６ａ１、６ａ２、６ｂ）を複雑な構造とすることを避け、コストを低減することができる。 Further, in the battery module (1) of the present invention, the pressing portion (6a3, 6a4, 6b1) is a protruding portion extending from the lashing member. That is, by making the pressing portion (6a3, 6a4, 6b1) a simple structure, it is possible to avoid making the lashing member (6a1, 6a2, 6b) a complicated structure and reduce the cost.

また本発明の電池モジュール（１）は、固縛部材（６ａ１、６ａ２、６ｂ）が筐体（３）とボルト（８）で接続され、二次電池（４）が底面（４ａ）方向に押圧されている。このように固縛部材６ａ１、６ａ２、６ｂを簡単なボルト８で固定することができるため、複雑な部材を用いるよりコスト低減できる。また固縛部材６ａ１、６ａ２、６ｂで電池４を押圧する場合にボルト８で押圧力を調整することができる。そのため、電池群１２ａ、１２ｂ毎に校差があったとしても各ボルト８で調整でき、各電池群１２ａ、１２ｂの放熱バランスを保つことができる。なお、本実施形態では各固縛部材すべてをそれぞれボルト８で固定していたが、よりコストを低減するためには中央の固縛部材６ｂのみ、または電池群１２ａ、１２ｂの両端に配置した固縛部材６ａ１、６ａ２のみにボルト８を設けてもよい。 Further, in the battery module (1) of the present invention, the lashing members (6a1, 6a2, 6b) are connected to the housing (3) by bolts (8), and the secondary battery (4) is pressed toward the bottom surface (4a). Has been done. Since the lashing members 6a1, 6a2, and 6b can be fixed with simple bolts 8 in this way, the cost can be reduced as compared with the use of complicated members. Further, when the battery 4 is pressed by the lashing members 6a1, 6a2, 6b, the pressing force can be adjusted by the bolt 8. Therefore, even if there is a school difference for each of the battery groups 12a and 12b, it can be adjusted with each bolt 8 and the heat dissipation balance of each battery group 12a and 12b can be maintained. In the present embodiment, all the lashing members are fixed with bolts 8, but in order to further reduce the cost, only the lashing member 6b in the center or the lashing members arranged at both ends of the battery groups 12a and 12b are fixed. Bolts 8 may be provided only on the binding members 6a1 and 6a2.

《実施例２》
続いて本発明の実施例２の形態を詳細に説明する。本実施例は、電池４の底面４ａと筐体２の第一の側壁２ａの間にスペーサ１３を配置した構造の例である。 << Example 2 >>
Subsequently, the embodiment of the second embodiment of the present invention will be described in detail. This embodiment is an example of a structure in which the spacer 13 is arranged between the bottom surface 4a of the battery 4 and the first side wall 2a of the housing 2.

すでに説明した同一の符号を付された構成と同一の機能を有する部分については説明を省略する。 The description of the portion having the same function as the configuration with the same reference numerals described above will be omitted.

図５は、実施例２の構造を示すものである。図５に示すように、各固縛部材６６（６６ａ１、６６ａ２、６６ｂ）にスペーサ１３が設けられている。このスペーサ１３は電池４と筐体２の第一の側壁２ａの間に設けられている。そして電池４と筐体２の第一の側壁２ａにおいて、スペーサ１３が配置されていない領域に熱伝導部材９を配置する。このとき、スペーサ１３の高さＨ４は押圧前の熱伝導部材９の高さＨ３より小さくなっている（Ｈ４＜Ｈ３）。 FIG. 5 shows the structure of the second embodiment. As shown in FIG. 5, spacers 13 are provided on each lashing member 66 (66a1, 66a2, 66b). The spacer 13 is provided between the battery 4 and the first side wall 2a of the housing 2. Then, in the first side wall 2a of the battery 4 and the housing 2, the heat conductive member 9 is arranged in a region where the spacer 13 is not arranged. At this time, the height H4 of the spacer 13 is smaller than the height H3 of the heat conductive member 9 before pressing (H4 <H3).

上述した本実施の形態によれば、第一の固縛部材６６（６６ａ１、６６ａ２、６６ｂ）をボルト８によって筐体２の第一の側壁２ａに固定する際に、スペーサ１３の高さにより、熱伝導部材９の高さは一定に保たれる。たとえば熱伝導部材９が熱伝導グリースやゲルのような柔らかい材質であってもスペーサ１３の高さ（Ｈ４）が保たれ、電池４と筐体２の第一の側壁２ａの絶縁距離を保つことができる。ここで、スペーサ１３は絶縁性であることが望ましく、例えば樹脂材料で形成するとよい。 According to the present embodiment described above, when the first lashing member 66 (66a1, 66a2, 66b) is fixed to the first side wall 2a of the housing 2 by the bolt 8, the height of the spacer 13 determines. The height of the heat conductive member 9 is kept constant. For example, even if the heat conductive member 9 is made of a soft material such as heat conductive grease or gel, the height (H4) of the spacer 13 is maintained, and the insulation distance between the battery 4 and the first side wall 2a of the housing 2 is maintained. Can be done. Here, the spacer 13 is preferably insulating, and may be formed of, for example, a resin material.

以上、本実施例について簡単にまとめる。 The above is a brief summary of this embodiment.

本実施例の電池モジュール（１）は、固縛部材（６６）が二次電池（４）の底面（４ａ）側にスペーサ部（１３）が設けられ、スペーサ部（１３）は、筐体（３）と二次電池（４）の底面（４ｃ）との間に配置される。このような構造にすることによって、ボルト８によって筐体２の第一の側壁２ａに固定する際に、スペーサ１３の高さにより、熱伝導部材９の高さが一定に保たれ、電池４と筐体２の第一の側壁２ａの絶縁距離を保つことができる。 In the battery module (1) of this embodiment, the lashing member (66) is provided with a spacer portion (13) on the bottom surface (4a) side of the secondary battery (4), and the spacer portion (13) is a housing (13). It is arranged between 3) and the bottom surface (4c) of the secondary battery (4). With such a structure, when the bolt 8 is used to fix the first side wall 2a of the housing 2, the height of the spacer 13 keeps the height of the heat conductive member 9 constant, so that the battery 4 and the battery 4 can be fixed. The insulation distance of the first side wall 2a of the housing 2 can be maintained.

《実施例３》
続いて本発明の実施例３の形態を詳細に説明する。本実施例では、電池４の底面４ａを筐体２の第一の側壁２ａに押圧するための固縛部材を凸形状部材１４と凹形状部材１５の２部材で構成した例である。 << Example 3 >>
Subsequently, the embodiment of Example 3 of the present invention will be described in detail. In this embodiment, the lashing member for pressing the bottom surface 4a of the battery 4 against the first side wall 2a of the housing 2 is composed of two members, a convex member 14 and a concave member 15.

すでに説明した同一の符号を付された構成と同一の機能を有する部分については説明を省略する。 The description of the portion having the same function as the configuration with the same reference numerals described above will be omitted.

図６は実施例３の構造を示すものである。図６に示す凸形状部材１４は凸形状の先端に向かうにつれて幅が狭くなる形状を有し、凹形状部材１５は凹部底面に向かうにつれて空間の幅が狭くなる形状となっている。ここで、凹形状部材１５の底面は筐体２の第一の側壁２ａに固定され、凸形状部材１４の凸形状の先端を凹型の空間に嵌めあわせる。凸形状部材１４の凸部先端は筐体２の第一の側壁２ａに対してボルト８によって固定する。この時、凸形状部材１４の凸形状が狭まる角度（θ１）は凹形状部材１５の凹部の側に向かって狭まる角度（θ２）より大きい角度とする（θ１＞θ２）。また、電池４と筐体２の第二の側壁２ｂの間には、固縛部材１６を配置する。 FIG. 6 shows the structure of the third embodiment. The convex member 14 shown in FIG. 6 has a shape in which the width becomes narrower toward the tip of the convex shape, and the concave member 15 has a shape in which the width of the space becomes narrower toward the bottom surface of the concave portion. Here, the bottom surface of the concave member 15 is fixed to the first side wall 2a of the housing 2, and the convex tip of the convex member 14 is fitted into the concave space. The tip of the convex portion of the convex member 14 is fixed to the first side wall 2a of the housing 2 by a bolt 8. At this time, the angle at which the convex shape of the convex member 14 narrows (θ1) is set to be larger than the angle at which the convex member 15 narrows toward the concave side (θ1> θ2). Further, a lashing member 16 is arranged between the battery 4 and the second side wall 2b of the housing 2.

上述した本実施の形態によれば、凸形状部材１４をボルト８で筐体２の第一の側壁２ａ方向に固定することで、凹型形状部材１５が電池４の短尺側面４ｃ方向に押し広げられる。これにより、電池４は筐体２の第二の側壁２ｂ方向に押圧され、電池４が固縛部材１６を押圧し、筐体２と圧接される。さらに、凸形状部材１４によって、電池４は底面４ａ方向にも押圧されるため、電池４は筐体２の第一の側壁２ａと第二の側壁２ｂの方向に同時に押圧され、電池４と固縛部材１６の間および固縛部材１６と筐体２の間の接触熱抵抗を低減することができる。この形状により、筐体２の第一の側壁２ａだけでなく、第二の側壁２ｂも電池４で生じた熱の放熱経路として活用することができ、電池４の温度上昇を効率的に抑制できる。 According to the present embodiment described above, by fixing the convex member 14 in the direction of the first side wall 2a of the housing 2 with the bolt 8, the concave member 15 is expanded in the direction of the short side surface 4c of the battery 4. .. As a result, the battery 4 is pressed in the direction of the second side wall 2b of the housing 2, the battery 4 presses the lashing member 16, and is in pressure contact with the housing 2. Further, since the battery 4 is also pressed in the direction of the bottom surface 4a by the convex member 14, the battery 4 is simultaneously pressed in the directions of the first side wall 2a and the second side wall 2b of the housing 2, and is solidified with the battery 4. It is possible to reduce the contact thermal resistance between the binding member 16 and between the fastening member 16 and the housing 2. Due to this shape, not only the first side wall 2a of the housing 2 but also the second side wall 2b can be utilized as a heat dissipation path of the heat generated in the battery 4, and the temperature rise of the battery 4 can be efficiently suppressed. ..

また、本実施例では実施例１、実施例２と比較して固縛部材１６に突起部を設けない構造とし、凸形状部材１４及び凹形状部材１５を一回ボルトで留めるだけで電池モジュールの前後方向及び左右方向に対して押圧できる。そのため実施例１及び実施例２では必要だった固縛部材６ａ１、６ａ２と筐体の第二の側壁２ｂとを押圧するためのボルト（図には不図示。左右方向のボルト）が不必要となる。したがって、各固縛部材をボルトで留める実施例１及び実施例２よりも工数を削減することができる。 Further, in this embodiment, as compared with the first and second embodiments, the lashing member 16 has a structure in which no protrusion is provided, and the convex member 14 and the concave member 15 can be bolted once to form the battery module. It can be pressed in the front-back direction and the left-right direction. Therefore, bolts (not shown in the figure, bolts in the left-right direction) for pressing the lashing members 6a1 and 6a2 and the second side wall 2b of the housing, which were necessary in the first and second embodiments, are unnecessary. Become. Therefore, the man-hours can be reduced as compared with the first and second embodiments in which each lashing member is bolted.

以上、本実施例について簡単にまとめる。 The above is a brief summary of this embodiment.

本実施例に記載の電池モジュール（１）は、固縛部材が、凹形状で凹部底面に向かうにつれて空間が狭くなる第一部材（１５）と、凸形状で凸部の先端に向かうにつれて幅が狭くなる第二部材（１４）とからなり、前記第二部材（１４）は前記第一部材（１５）に嵌め合わされている。このような構造にすることによって、１個のボルト８で電池群１２ａ、１２ｂを前後方向及び左右方向に固縛することが可能となり、工数と部品を削減しつつ、電池モジュール１の放熱性を向上することができる。 The battery module (1) described in this embodiment has a first member (15) having a concave shape and a space narrowing toward the bottom surface of the recess, and a convex member having a width toward the tip of the convex portion. It is composed of a narrowing second member (14), and the second member (14) is fitted to the first member (15). With such a structure, the battery groups 12a and 12b can be fixed in the front-rear direction and the left-right direction with one bolt 8, and the heat dissipation of the battery module 1 can be improved while reducing the man-hours and parts. Can be improved.

《実施例４》
続いて本発明の実施例４の形態を詳細に説明する。本実施例は、筐体２の第二の側壁２ｂが底面に向かって狭まる構造とし、さらに電池群１２ａ、１２ｂの両端に配置された固縛部材の形状をくさび形とした構造の例である。 << Example 4 >>
Subsequently, the embodiment of Example 4 of the present invention will be described in detail. This embodiment is an example of a structure in which the second side wall 2b of the housing 2 narrows toward the bottom surface, and the shape of the lashing members arranged at both ends of the battery groups 12a and 12b is wedge-shaped. ..

すでに説明した同一の符号を付された構成と同一の機能を有する部分については説明を省略する。 The description of the portion having the same function as the configuration with the same reference numerals described above will be omitted.

図７は実施例４の構造を示すものである。電池４の第二の側壁４ｃと筐体２の第二の側壁４ｂの間にくさび形部材１７を設けた。このくさび形部材１７は筐体２の底面２ｄに向かって幅が狭くなる形状とする。また、筐体２の側壁も同様に底面２ｄに向かって幅が狭くなる形状となっている。 FIG. 7 shows the structure of the fourth embodiment. A wedge-shaped member 17 is provided between the second side wall 4c of the battery 4 and the second side wall 4b of the housing 2. The wedge-shaped member 17 has a shape in which the width becomes narrower toward the bottom surface 2d of the housing 2. Further, the side wall of the housing 2 also has a shape in which the width becomes narrower toward the bottom surface 2d.

上述した本実施の形態によれば、電池群１２ａ、１２ｂを固定する第一の固縛部材６ｂとくさび形部材１７を筐体２に配置するとき、くさび形部材１７は筐体２の第二の側壁２ｂと嵌め合わされ、筐体２に固定さする構造とした。さらに第一の固縛部材６ｂをボルト８（図７には図示せず）によって筐体２に固定することで、電池４の底面４ａが筐体２の第一の側壁２ａ（図７には図示せず）に押圧されると同時に、くさび形部材１７は筐体２にも圧接する構造となる。この形状により、筐体２の第一の側壁２ａだけでなく、第二の側壁２ｂも電池４で生じた熱の放熱経路として活用することができ、電池４の温度上昇を効率的に抑制することができる。さらに、くさび形部材１７を使用することによって、中央に配置されている第一の固縛部材６ｂの構造を単純なものとすることができるという利点がある。 According to the present embodiment described above, when the first lashing member 6b and the wedge-shaped member 17 for fixing the battery groups 12a and 12b are arranged in the housing 2, the wedge-shaped member 17 is the second of the housing 2. The structure is such that it is fitted to the side wall 2b of the above and fixed to the housing 2. Further, by fixing the first lashing member 6b to the housing 2 with bolts 8 (not shown in FIG. 7), the bottom surface 4a of the battery 4 becomes the first side wall 2a of the housing 2 (not shown in FIG. 7). The wedge-shaped member 17 has a structure in which the wedge-shaped member 17 is also pressed against the housing 2 at the same time as being pressed by (not shown). Due to this shape, not only the first side wall 2a of the housing 2 but also the second side wall 2b can be utilized as a heat dissipation path of the heat generated by the battery 4, and the temperature rise of the battery 4 can be efficiently suppressed. be able to. Further, by using the wedge-shaped member 17, there is an advantage that the structure of the first lashing member 6b arranged at the center can be simplified.

《実施例５》
最後に本発明の実施例５の形態を詳細に説明する。本実施例は、固縛部材１６と筐体２の間に熱伝導部材を配置した例を示す。 << Example 5 >>
Finally, the embodiment of Example 5 of the present invention will be described in detail. This embodiment shows an example in which a heat conductive member is arranged between the lashing member 16 and the housing 2.

すでに説明した同一の符号を付された構成と同一の機能を有する部分については説明を省略する。 The description of the portion having the same function as the configuration with the same reference numerals described above will be omitted.

図８は実施例５の構造を示す。図８に示す熱拡散部材１８は、固縛部材１６と筐体２の第二の側壁２ｂの間に配置し、筐体２の側壁の内面に沿って固定されている。この熱拡散部材１８は第二の側壁２ｂから第三の側壁２ｃに連続して設けられている。このような構造にすることによって、電池４が接触していない第三の側壁２ｃに熱を逃がすことが可能となる。また、熱拡散部材１８は筐体２を構成する材料以上の高熱伝導率の材質であることが望ましく、たとえばアルミ板や銅板、可撓性を有する熱伝導シート、グラファイトシートなどとすることが好ましい。 FIG. 8 shows the structure of Example 5. The heat diffusion member 18 shown in FIG. 8 is arranged between the lashing member 16 and the second side wall 2b of the housing 2, and is fixed along the inner surface of the side wall of the housing 2. The heat diffusion member 18 is continuously provided from the second side wall 2b to the third side wall 2c. With such a structure, heat can be released to the third side wall 2c to which the battery 4 is not in contact. Further, the heat diffusion member 18 is preferably made of a material having a higher thermal conductivity than the material constituting the housing 2, and is preferably made of, for example, an aluminum plate, a copper plate, a flexible heat conductive sheet, a graphite sheet, or the like. ..

上述した本実施の形態によれば、固縛部材１６が熱拡散部材１８に圧接されることで、電池４の熱は熱拡散部材１８に効率的に伝わり、熱拡散部材１８により、筐体２の第三の側面２ｃ方向まで電池で発生した熱を伝えることができ、電池４の温度上昇を効率的に抑制できる。なお、本実施例では一方側の側壁２ｂから側壁２ｃに熱拡散部材１８が設けられているが、両側の側壁２ｂから側壁２ｃに渡って熱拡散部材１８が設けられる構造となっていてもよい。この場合には２つの電池群１２ａ、１２ｂがバランスよく冷却されるという利点がある。一方で一方側の側壁２ｂから側壁２ｃに熱拡散部材１８を設ける場合は、例えば一方側の側壁２ｂ（例えば電池群１２ｂ側の側壁）にしか風があたらないといったような車載レイアウトの場合に、電池群１２ｂだけが大きく冷却されて電池群１２ａと電池群１２ｂでの冷却バランスが悪くなるのを抑制できる、といったような効果を奏する。 According to the above-described embodiment, when the lashing member 16 is pressed against the heat diffusion member 18, the heat of the battery 4 is efficiently transferred to the heat diffusion member 18, and the heat diffusion member 18 causes the housing 2 to transfer heat. The heat generated by the battery can be transferred to the third side surface 2c direction of the above, and the temperature rise of the battery 4 can be efficiently suppressed. In this embodiment, the heat diffusion member 18 is provided from the side wall 2b to the side wall 2c on one side, but the structure may be such that the heat diffusion member 18 is provided from the side wall 2b on both sides to the side wall 2c. .. In this case, there is an advantage that the two battery groups 12a and 12b are cooled in a well-balanced manner. On the other hand, when the heat diffusion member 18 is provided from the side wall 2b to the side wall 2c on one side, for example, in the case of an in-vehicle layout in which the wind only hits the side wall 2b on one side (for example, the side wall on the battery group 12b side). It is possible to prevent the cooling balance between the battery group 12a and the battery group 12b from becoming poor due to the large cooling of only the battery group 12b.

以上、本実施例についてまとめる。 The above is a summary of this embodiment.

本実施例では二次電池モジュール（１）は、 筐体（３）と電池群（１２ａ、１２ｂ）を構成する二次電池（４）の第一の側面（２ｂ）との間には熱拡散部材（１８）が配置され、熱拡散部材（１８）は、筐体（３）と電池群（１２ａ、１２ｂ）とが接続されていない当該筐体の面（２ｃ）と接触することを特徴とする。このような構造にすることによって、電池４が接触していない第三の側壁２ｃに熱を逃がすことが可能となり、冷却効率が向上する。 In this embodiment, the secondary battery module (1) is thermally diffused between the housing (3) and the first side surface (2b) of the secondary battery (4) constituting the battery group (12a, 12b). The member (18) is arranged, and the heat diffusion member (18) is characterized in that the housing (3) and the battery group (12a, 12b) are in contact with the surface (2c) of the housing to which they are not connected. do. With such a structure, heat can be released to the third side wall 2c to which the battery 4 is not in contact, and the cooling efficiency is improved.

以上、本発明の実施形態について詳述したが、本発明は、前記の実施形態に限定されるものではなく、特許請求の範囲に記載された本発明の精神を逸脱しない範囲で、種々の設計変更を行うことができるものである。例えば、前記した実施の形態は本発明を分かりやすく説明するために詳細に説明したものであり、必ずしも説明した全ての構成を備えるものに限定されるものではない。また、ある実施形態の構成の一部を他の実施形態の構成に置き換えることが可能であり、また、ある実施形態の構成に他の実施形態の構成を加えることも可能である。さらに、各実施形態の構成の一部について、他の構成の追加・削除・置換をすることが可能である。 Although the embodiments of the present invention have been described in detail above, the present invention is not limited to the above-described embodiments, and various designs are designed without departing from the spirit of the present invention described in the claims. You can make changes. For example, the above-described embodiment has been described in detail in order to explain the present invention in an easy-to-understand manner, and is not necessarily limited to the one including all the described configurations. Further, it is possible to replace a part of the configuration of one embodiment with the configuration of another embodiment, and it is also possible to add the configuration of another embodiment to the configuration of one embodiment. Further, it is possible to add / delete / replace a part of the configuration of each embodiment with another configuration.

１…二次電池モジュール
２…筐体
２ａ…第一の側壁
２ｂ…第二の側壁
２ｃ…第三の側壁
２ｄ…底面
３…筐体蓋
４…電池
４ａ…底面
４ｂ…長尺側面
４ｃ…短尺側面
４ｄ…電池上面
５…電極端子
６ａ１、６ａ２、６ｂ…第一の固縛部材
６ａ３、６ａ４、６ｂ１…突起部
８…ボルト
９…熱伝導部材
１０…第二の固縛部材
１１…制御装置
１３…スペーサ
１４…凸形状部材
１５…凹形状部材
１６…固縛部材
１７…くさび形部材
１８…熱拡散部材 1 ... Secondary battery module 2 ... Housing 2a ... First side wall 2b ... Second side wall 2c ... Third side wall 2d ... Bottom surface 3 ... Housing cover 4 ... Battery 4a ... Bottom surface 4b ... Long side surface 4c ... Short Side surface 4d ... Battery top surface 5 ... Electrode terminals 6a1, 6a2, 6b ... First lashing member 6a3, 6a4, 6b1 ... Projection 8 ... Bolt 9 ... Heat conductive member 10 ... Second lashing member 11 ... Control device 13 ... Spacer 14 ... Convex member 15 ... Concave member 16 ... Fastening member 17 ... Wedge-shaped member 18 ... Heat diffusion member

Claims (9)

一対の第一の側面と、一対の第二の側面と、前記第一及び第二の側面と繋がる底面を有する二次電池を、前記第一の側面同士が対向するように積層された電池群と、
前記電池群を構成する二次電池の第二の側面と接続され、当該第二の側面方向に押圧する固縛部材と、
前記電池群及び前記固縛部材を収納し、前記二次電池の底面と直接的又は間接的に密着する筐体と、を備えた電池モジュールにおいて、
前記固縛部材は、前記電池群を構成する二次電池の底面方向に押圧する押圧部を有し、
前記固縛部材は、前記二次電池の底面側にスペーサ部が設けられ、
前記スペーサ部は、前記筐体と前記二次電池の底面との間に配置されることを特徴とする電池モジュール。 A group of batteries in which a pair of first side surfaces, a pair of second side surfaces, and a secondary battery having a bottom surface connected to the first and second side surfaces are laminated so that the first side surfaces face each other. When,
A lashing member that is connected to the second side surface of the secondary battery that constitutes the battery group and presses in the direction of the second side surface.
In a battery module including the battery group and a housing that houses the lashing member and is in direct or indirect contact with the bottom surface of the secondary battery.
The lashing member has a pressing portion that presses toward the bottom surface of the secondary battery constituting the battery group .
The lashing member is provided with a spacer portion on the bottom surface side of the secondary battery.
The spacer portion includes a battery module, wherein Rukoto disposed between the bottom surface of the secondary battery and said housing. 請求項１に記載の電池モジュールにおいて、
前記押圧部は、前記二次電池と当接する突起部であることを特徴とする電池モジュール。 In the battery module according to claim 1,
The battery module is characterized in that the pressing portion is a protrusion that comes into contact with the secondary battery. 請求項１又は２に記載の電池モジュールにおいて、
前記固縛部材は前記筐体とボルトで接続され、前記二次電池の底面方向に押圧されていることを特徴とする電池モジュール。 In the battery module according to claim 1 or 2.
A battery module characterized in that the lashing member is connected to the housing with bolts and pressed toward the bottom surface of the secondary battery. 一対の第一の側面と、一対の第二の側面と、前記第一及び第二の側面と繋がる底面を有する二次電池を、前記第一の側面同士が対向するように積層された電池群と、
前記電池群を構成する二次電池の第二の側面と接続され、当該第二の側面方向に押圧する固縛部材と、
前記電池群及び前記固縛部材を収納し、前記二次電池の底面と直接的又は間接的に密着する筐体と、を備えた電池モジュールにおいて、
前記固縛部材は、前記電池群を構成する二次電池の底面方向に押圧する押圧部を有し、
前記固縛部材は、凹形状で凹部底面に向かうにつれて空間が狭くなる第一部材と、凸形状で凸部の先端に向かうにつれて幅が狭くなる第二部材とからなり、前記第二部材は前記第一部材に嵌め合わされていることを特徴とする電池モジュール。 A group of batteries in which a pair of first side surfaces, a pair of second side surfaces, and a secondary battery having a bottom surface connected to the first and second side surfaces are laminated so that the first side surfaces face each other. When,
A lashing member that is connected to the second side surface of the secondary battery that constitutes the battery group and presses in the direction of the second side surface.
In a battery module including the battery group and a housing that houses the lashing member and is in direct or indirect contact with the bottom surface of the secondary battery.
The lashing member has a pressing portion that presses toward the bottom surface of the secondary battery constituting the battery group.
The lashing member is composed of a first member having a concave shape and a space narrowing toward the bottom surface of the recess, and a second member having a convex shape and narrowing the width toward the tip of the convex portion. A battery module characterized by being fitted to the first member. 請求項４に記載の電池モジュールにおいて、
前記押圧部は、前記二次電池と当接する突起部であることを特徴とする電池モジュール。 In the battery module according to claim 4,
The pressing portion includes a battery module, wherein the protrusion der Rukoto for contact with the secondary battery. 請求項４又は５に記載の電池モジュールにおいて、
前記第二部材は前記筐体とボルトで接続され、前記二次電池の底面方向に押圧されていることを特徴とする電池モジュール。 In the battery module according to claim 4 or 5.
A battery module characterized in that the second member is connected to the housing with a bolt and is pressed toward the bottom surface of the secondary battery. 請求項４又は５に記載の電池モジュールにおいて、
前記第二部材は前記筐体とボルトで接続され、前記二次電池の第一の側面方向に押圧されていることを特徴とする電池モジュール。 In the battery module according to claim 4 or 5.
A battery module characterized in that the second member is connected to the housing with a bolt and is pressed in the direction of the first side surface of the secondary battery. 請求項１乃至７の何れかに記載の電池モジュールにおいて、
前記筐体と前記電池群を構成する二次電池の第一の側面との間には熱拡散部材が配置され、
前記熱拡散部材は、前記筐体と前記電池群とが接続されていない当該筐体の面と接触することを特徴とする電池モジュール。 In the battery module according to any one of claims 1 to 7.
A heat diffusion member is arranged between the housing and the first side surface of the secondary battery constituting the battery group.
The battery module is characterized in that the heat diffusion member comes into contact with a surface of the housing to which the housing and the battery group are not connected. 請求項８に記載の電池モジュールにおいて、
前記熱拡散部材は、グラファイトシートであることを特徴とする電池モジュール。
In the battery module according to claim 8.
The battery module characterized in that the heat diffusion member is a graphite sheet.
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