JP2008062780A - Electrical device cooling structure in vehicle - Google Patents

Electrical device cooling structure in vehicle Download PDF

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JP2008062780A
JP2008062780A JP2006242488A JP2006242488A JP2008062780A JP 2008062780 A JP2008062780 A JP 2008062780A JP 2006242488 A JP2006242488 A JP 2006242488A JP 2006242488 A JP2006242488 A JP 2006242488A JP 2008062780 A JP2008062780 A JP 2008062780A
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Prior art keywords
battery
converter
cooling air
vehicle
power supply
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JP2006242488A
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JP4832225B2 (en
Inventor
Tomohiro Fukatsu
友博 深津
Takeo Nishibori
毅雄 西堀
Kentaro Shibuya
健太郎 澁谷
Masao Kawada
政夫 川田
Hirohisa Yamaguchi
浩央 山口
Junya Fujisawa
純也 藤澤
Atsushi Nakano
篤 中野
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Honda Motor Co Ltd
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Honda Motor Co Ltd
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Priority to JP2006242488A priority Critical patent/JP4832225B2/en
Priority to EP20070115723 priority patent/EP1897739B1/en
Priority to DE200760010216 priority patent/DE602007010216D1/en
Priority to CN2007101497469A priority patent/CN101138963B/en
Priority to CN2010105982431A priority patent/CN102050009B/en
Priority to US11/851,631 priority patent/US7688582B2/en
Publication of JP2008062780A publication Critical patent/JP2008062780A/en
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Publication of JP4832225B2 publication Critical patent/JP4832225B2/en
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    • 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
    • H05K7/20—Modifications to facilitate cooling, ventilating, or heating
    • H05K7/2089—Modifications to facilitate cooling, ventilating, or heating for power electronics, e.g. for inverters for controlling motor
    • H05K7/20909—Forced ventilation, e.g. on heat dissipaters coupled to components
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L50/00—Electric propulsion with power supplied within the vehicle
    • B60L50/50—Electric propulsion with power supplied within the vehicle using propulsion power supplied by batteries or fuel cells
    • B60L50/60—Electric propulsion with power supplied within the vehicle using propulsion power supplied by batteries or fuel cells using power supplied by batteries
    • B60L50/66—Arrangements of batteries
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
    • B60L58/10—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
    • B60L58/24—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries for controlling the temperature of batteries
    • B60L58/26—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries for controlling the temperature of batteries by cooling
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L2210/00—Converter types
    • B60L2210/10—DC to DC converters
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L2210/00—Converter types
    • B60L2210/40—DC to AC converters
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L2240/00—Control parameters of input or output; Target parameters
    • B60L2240/40—Drive Train control parameters
    • B60L2240/52—Drive Train control parameters related to converters
    • B60L2240/525—Temperature of converter or components thereof
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L2240/00—Control parameters of input or output; Target parameters
    • B60L2240/40—Drive Train control parameters
    • B60L2240/54—Drive Train control parameters related to batteries
    • B60L2240/545—Temperature
    • 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
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/70—Energy storage systems for electromobility, e.g. batteries
    • 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
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/72—Electric energy management in electromobility

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Sustainable Development (AREA)
  • Sustainable Energy (AREA)
  • Power Engineering (AREA)
  • Transportation (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Arrangement Or Mounting Of Propulsion Units For Vehicles (AREA)
  • Electric Propulsion And Braking For Vehicles (AREA)
  • Cooling, Air Intake And Gas Exhaust, And Fuel Tank Arrangements In Propulsion Units (AREA)
  • Secondary Cells (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To enhance cooling performance while avoiding enlargement of an electrical device arranged below a floor behind a seat to drive a travel motor. <P>SOLUTION: In a power supply unit 19 disposed below the floor behind the seat 16, battery modules 37 are disposed in a lower position, and a DC/DC converter 41 and a motor driving inverter are disposed side by side in a vehicle width direction above the battery modules 37. Thus, cooling air flowing from the front side to the rear side of a vehicle body is divided into upper and lower portions to cool in parallel the DC/DC 41 and the motor driving inverter 42 on the upper side and the battery modules 37 on the lower side. Thus, it is possible to simplify a passage of the cooling air to reduce the size of the entire power supply unit 19, and improve mountability of the power supply unit 19 on the vehicle body. Also, it is possible to apply cooling air at low temperature before heat exchange to all the battery module 37, the DC/DC converter 41, and the motor driving inverter 42, thereby enhancing cooling effect. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

本発明は、走行用モータを駆動するためのバッテリ、ＤＣ／ＤＣコンバータおよびモータ駆動用インバータを含む電気機器をシートの後方のフロアの下方に配置し、その電気機器を冷却空気で冷却する車両における電気機器の冷却構造に関する。   The present invention relates to a vehicle in which an electric device including a battery for driving a traveling motor, a DC / DC converter, and a motor driving inverter is disposed below a floor behind the seat, and the electric device is cooled by cooling air. The present invention relates to a cooling structure for electrical equipment.

自動車の走行用モータを駆動する電池を含む電源装置をリヤシートの後方のトランクルームに搭載し、この電源装置に一体に設けた強制送風機が供給する冷却空気で電池を冷却するものが、下記特許文献１により公知である。   A power supply device including a battery for driving a motor for driving an automobile is mounted in a trunk room behind a rear seat, and the battery is cooled by cooling air supplied by a forced blower provided integrally with the power supply device. Is known.

また自動車の走行用モータを駆動するバッテリ、ＤＣ／ＤＣコンバータ、モータ駆動用インバータ、冷却ファン等を含む蓄電装置をリヤシートの下方に配置し、冷却ファンで吸引した冷却空気でバッテリ、ＤＣ／ＤＣコンバータおよびモータ駆動用インバータを冷却するものが、下記特許文献２により公知である。
特開２００３−４５３９２号公報 特開２００５−１５３８２７号公報 In addition, a battery, a DC / DC converter, a battery that drives a motor for driving a vehicle, a DC / DC converter, an inverter for driving a motor, a cooling fan, and the like are arranged below the rear seat, and the battery and the DC / DC converter are cooled by the cooling air sucked by the cooling fan. Further, it is known from Patent Document 2 below that the motor driving inverter is cooled.
JP 2003-45392 A JP 2005-153827 A

ところで上記特許文献１に記載されたものは、電源装置の電池を強制送風機が供給する冷却空気で冷却するようになっているが、電源装置に含まれるＤＣ／ＤＣコンバータやモータ駆動用インバータの冷却については開示していない。   By the way, although what was described in the said patent document 1 cools the battery of a power supply device with the cooling air which a forced air blower supplies, cooling of the DC / DC converter contained in a power supply device or the inverter for a motor drive is carried out. Is not disclosed.

また上記特許文献２に記載されたものは、バッテリ、ＤＣ／ＤＣコンバータ、モータ駆動用インバータおよび冷却ファンを車幅方向に直列に配置し、冷却ファンで吸引した冷却空気でバッテリ、ＤＣ／ＤＣコンバータおよびモータ駆動用インバータを順次冷却するようになっている。   In addition, what is described in Patent Document 2 is that a battery, a DC / DC converter, a motor driving inverter, and a cooling fan are arranged in series in the vehicle width direction, and the battery, the DC / DC converter are cooled by cooling air sucked by the cooling fan. And the motor drive inverter is cooled sequentially.

この場合、冷却空気はバッテリ、ＤＣ／ＤＣコンバータおよびモータ駆動用インバータを冷却する間に熱交換により次第に温度上昇するため、上流側のバッテリを充分に冷却することができても、下流側のモータ駆動用インバータを充分に冷却できなくなる可能性がある。しかも、バッテリ、ＤＣ／ＤＣコンバータ、モータ駆動用インバータおよび冷却ファンを直列に配置しているので、電源装置の寸法が長大になって車両への搭載に大きな制約があるだけでなく、冷却空気の通路の流路抵抗が増えるために大型で高性能な冷却ファンが必要となる問題がある。   In this case, the cooling air gradually increases in temperature by heat exchange while cooling the battery, the DC / DC converter, and the motor driving inverter. Therefore, even if the upstream battery can be sufficiently cooled, the downstream motor There is a possibility that the drive inverter cannot be sufficiently cooled. In addition, since the battery, DC / DC converter, motor drive inverter and cooling fan are arranged in series, the size of the power supply device becomes long, which not only greatly restricts the mounting on the vehicle, but also reduces the amount of cooling air. There is a problem that a large and high-performance cooling fan is required because the passage resistance of the passage increases.

本発明は前述の事情に鑑みてなされたもので、走行用モータを駆動すべくシートの後方のフロアの下方に配置した電気機器の大型化を回避しながら、その冷却性能を高めることを目的とする。   The present invention has been made in view of the above-described circumstances, and an object thereof is to improve the cooling performance while avoiding an increase in size of an electric device disposed below a floor behind a seat so as to drive a traveling motor. To do.

上記目的を達成するために、請求項１に記載された発明によれば、走行用モータを駆動するためのバッテリ、ＤＣ／ＤＣコンバータおよびモータ駆動用インバータを含む電気機器をシートの後方のフロアの下方に配置し、その電気機器を冷却空気で冷却する車両における電気機器の冷却構造であって、前記バッテリの上部に前記ＤＣ／ＤＣコンバータおよび前記モータ駆動用インバータを車幅方向に並置し、車体前方から後方に流れる冷却空気は上下に分かれ、下側の前記バッテリと、上側の前記ＤＣ／ＤＣコンバータおよび前記モータ駆動用インバータとをパラレルに冷却することを特徴とする、車両における電気機器の冷却構造が提案される。   In order to achieve the above object, according to the first aspect of the present invention, an electric device including a battery for driving a traveling motor, a DC / DC converter, and a motor driving inverter is mounted on the floor behind the seat. A cooling structure for an electric device in a vehicle which is disposed below and cools the electric device with cooling air, wherein the DC / DC converter and the motor driving inverter are juxtaposed in the vehicle width direction above the battery. Cooling air that flows from the front to the rear is divided into upper and lower parts, and the lower battery, the upper DC / DC converter, and the motor driving inverter are cooled in parallel. A structure is proposed.

また請求項２に記載された発明によれば、請求項１の構成に加えて、前記バッテリの車幅方向一側に高圧配電盤を配置し、この高圧配電盤の延出部を前記バッテリの上端から上方に延出させ、前記延出部を前記ＤＣ／ＤＣコンバータまたは前記モータ駆動用インバータに設けた平滑化コンデンサに接続したことを特徴とする、車両における電気機器の冷却構造が提案される。   According to the invention described in claim 2, in addition to the configuration of claim 1, a high-voltage switchboard is arranged on one side in the vehicle width direction of the battery, and the extending portion of the high-voltage switchboard is connected to the upper end of the battery. A cooling structure for an electric device in a vehicle is proposed, characterized in that it extends upward and the extension portion is connected to a smoothing capacitor provided in the DC / DC converter or the motor drive inverter.

また請求項３に記載された発明によれば、請求項２の構成に加えて、前記高圧配電盤に前記バッテリからの電流を遮断するコンタクタを配置したことを特徴とする、車両における電気機器の冷却構造が提案される。   According to a third aspect of the present invention, in addition to the configuration of the second aspect, the contactor for cutting off the current from the battery is disposed on the high-voltage switchboard. A structure is proposed.

また請求項４に記載された発明によれば、請求項１〜請求項４の何れか１項の構成に加えて、前記ＤＣ／ＤＣコンバータおよび前記モータ駆動用インバータは車体に固定された共通の金属ケースに収納され、この金属ケースの下面に前記バッテリを支持したことを特徴とする、車両における電気機器の冷却構造が提案される。   According to a fourth aspect of the present invention, in addition to the configuration of any one of the first to fourth aspects, the DC / DC converter and the motor drive inverter are fixed to a vehicle body. A cooling structure for an electric device in a vehicle is proposed, which is housed in a metal case and the battery is supported on the lower surface of the metal case.

尚、実施の形態のリヤシート１６は本発明のシートに対応し、実施の形態の電源ユニット１９は本発明の電気機器に対応し、実施の形態のリヤフロア２７は本発明のフロアに対応し、実施の形態のバッテリモジュール３７は本発明のバッテリに対応し、実施の形態の下部金属ケース４５および上部金属ケース４６は本発明の金属ケースに対応する。   The rear seat 16 of the embodiment corresponds to the seat of the present invention, the power supply unit 19 of the embodiment corresponds to the electric device of the present invention, and the rear floor 27 of the embodiment corresponds to the floor of the present invention. The battery module 37 of the form corresponds to the battery of the present invention, and the lower metal case 45 and the upper metal case 46 of the embodiment correspond to the metal case of the present invention.

請求項１の構成によれば、走行用モータを駆動すべくシートの後方のフロアの下方に配置された電気機器のうち、バッテリを下部に配置するとともに、その上部にＤＣ／ＤＣコンバータおよびモータ駆動用インバータを車幅方向に並置したので、車体前方から後方に流れる冷却空気は上下に分かれて下側のバッテリと、上側のＤＣ／ＤＣコンバータおよびモータ駆動用インバータとをパラレルに冷却することが可能となる。これにより、冷却空気の通路を単純化して電気機器全体を小型化し、車体への搭載性を高めることができるだけでなく、バッテリ、ＤＣ／ＤＣコンバータおよびモータ駆動用インバータの全てに熱交換前の低温の冷却空気を作用させて冷却効果を高めることができ、しかも冷却空気の圧損を低減することができる。   According to the configuration of the first aspect, among the electric devices disposed below the floor behind the seat to drive the traveling motor, the battery is disposed in the lower part, and the DC / DC converter and the motor drive are disposed in the upper part. Since the inverters are juxtaposed in the vehicle width direction, the cooling air flowing from the front to the rear of the vehicle can be divided into upper and lower parts to cool the lower battery, the upper DC / DC converter and the motor drive inverter in parallel. It becomes. This not only simplifies the passage of the cooling air, downsizes the entire electrical equipment and enhances the mountability to the vehicle body, but also lowers the temperature before heat exchange in all of the battery, the DC / DC converter and the motor drive inverter. The cooling air can be applied to increase the cooling effect, and the pressure loss of the cooling air can be reduced.

また請求項２の構成によれば、バッテリの車幅方向一側に配置した高圧配電盤を該バッテリの上端から上方に延出させた延出部を、ＤＣ／ＤＣコンバータまたはモータ駆動用インバータに設けた平滑化コンデンサに接続したので、高圧配電盤、平滑化コンデンサ、ＤＣ／ＤＣコンバータおよびモータ駆動用インバータ間を接続するケーブルを廃止あるいは最短化することができる。   According to the second aspect of the present invention, the DC / DC converter or the motor drive inverter is provided with an extending portion that extends upward from the upper end of the battery to the high-voltage switchboard disposed on one side in the vehicle width direction of the battery. Therefore, the cables connecting the high-voltage switchboard, the smoothing capacitor, the DC / DC converter, and the motor driving inverter can be eliminated or minimized.

また請求項３の構成によれば、バッテリからの電流を遮断するコンタクタを高圧配電盤に配置したので、バッテリ、コンタクタおよび電気機器間を接続するケーブルを廃止あるいは最短化することができる。   According to the third aspect of the present invention, since the contactor that cuts off the current from the battery is disposed on the high-voltage switchboard, the cable that connects the battery, the contactor, and the electric device can be eliminated or minimized.

また請求項４の構成によれば、ＤＣ／ＤＣコンバータおよびモータ駆動用インバータを車体に固定した共通の金属ケースに収納し、この金属ケースにの下面にバッテリを支持したので、ＤＣ／ＤＣコンバータやモータ駆動用インバータから発生する電気ノイズを金属ケースで効果的に遮断することができるだけでなく、比較的に重量の大きいバッテリを下側に配置し、比較的に重量の小さいＤＣ／ＤＣコンバータおよびモータ駆動用インバータを上側に配置して車体の安定性を高めることができる。   According to the fourth aspect of the present invention, the DC / DC converter and the motor drive inverter are housed in a common metal case fixed to the vehicle body, and the battery is supported on the lower surface of the metal case. A DC / DC converter and a motor that can not only effectively block electrical noise generated from an inverter for driving a motor with a metal case, but also have a relatively heavy battery placed on the lower side and a relatively light weight. The driving inverter can be arranged on the upper side to improve the stability of the vehicle body.

以下、本発明の実施の形態を添付の図面に基づいて説明する。   Embodiments of the present invention will be described below with reference to the accompanying drawings.

図１〜図９は本発明の実施の形態を示すもので、図１はハイブリッド車両の全体側面図、図２は図１の要部拡大図、図３は樹脂ケースおよび電源ユニットの分解斜視図、図４は電源ユニットの分解斜視図、図５は図２の５方向矢視図、図６は図５の６−６線断面図、図７は図６の７−７線断面図、図８は図７の８−８線断面図、図９は電源ユニット冷却の作用説明図である。   1 to 9 show an embodiment of the present invention. FIG. 1 is an overall side view of a hybrid vehicle, FIG. 2 is an enlarged view of a main part of FIG. 1, and FIG. 3 is an exploded perspective view of a resin case and a power supply unit. 4 is an exploded perspective view of the power supply unit, FIG. 5 is a view taken in the direction of arrow 5 in FIG. 2, FIG. 6 is a cross-sectional view taken along line 6-6 in FIG. 8 is a cross-sectional view taken along line 8-8 in FIG. 7, and FIG.

図１および図２に示すように、図示せぬエンジンおよびモータを走行用駆動源とするハイブリッド車両は、シートクッション１１およびシートバック１２よりなるフロントシート１３と、シートクッション１４およびシートバック１５よりなるリヤシート１６とを備える。フロントシート１３のシートクッション１１の下方には燃料タンク１７が配置されるとともに、リヤシート１６の後方のラッゲージスペース１８の下方にはモータを駆動するための電源ユニット１９が搭載される。   As shown in FIGS. 1 and 2, a hybrid vehicle using an unshown engine and motor as a driving source for driving includes a front seat 13 including a seat cushion 11 and a seat back 12, and a seat cushion 14 and a seat back 15. And a rear seat 16. A fuel tank 17 is disposed below the seat cushion 11 of the front seat 13, and a power supply unit 19 for driving the motor is mounted below the luggage space 18 behind the rear seat 16.

リヤシート１６のシートクッション１４の下面には左右一対のステー２０，２０が折り畳み可能に設けられており、リヤシート１６の使用状態では、ステー２０，２０の下端をリヤシート１６のシート下フロア２１に設けたフック２２，２２に係止し、かつシートクッション１４の後端をシート下フロア２１の後方の隆起部２３に設けたシートクッション係止部２４に係止して固定するようになっている。シートバック１５はシートクッション１４の後端に設けたリクライニング軸２５を介して前方に倒伏可能である。   A pair of left and right stays 20, 20 are foldably provided on the lower surface of the seat cushion 14 of the rear seat 16. When the rear seat 16 is in use, the lower ends of the stays 20, 20 are provided on the lower seat floor 21 of the rear seat 16. The rear end of the seat cushion 14 is locked to the hooks 22 and 22 and is fixed to the seat cushion locking portion 24 provided on the raised portion 23 on the rear side of the lower seat floor 21. The seat back 15 can fall forward through a reclining shaft 25 provided at the rear end of the seat cushion 14.

従って、シートクッション１４の後端を隆起部２３のシートクッション係止部２４から分離すると、ステー２０，２０がフック２２，２２を支点にして前方に揺動することで、シートクッション１４がシート下フロア２１に沿う位置まで前下方に平行移動しながら沈下する。そしてシートバック１５をリクライニング軸２５を中心として前方に揺動させることで、シートバック１５が略水平になるようにリヤシート１６が折り畳まれる（図２の鎖線参照）。   Accordingly, when the rear end of the seat cushion 14 is separated from the seat cushion locking portion 24 of the raised portion 23, the stays 20 and 20 swing forward with the hooks 22 and 22 serving as fulcrums, thereby causing the seat cushion 14 to move under the seat. It sinks while parallelly moving forward and downward to a position along the floor 21. Then, by swinging the seat back 15 forward about the reclining shaft 25, the rear seat 16 is folded so that the seat back 15 becomes substantially horizontal (see the chain line in FIG. 2).

シート下フロア２１の後方の隆起部２３の後方には下方に凹んだ電源ユニット収納部２６が連続しており、この電源ユニット収納部２６の上面開口部の周囲がラッゲージスペース１８のフロアを構成するリヤフロア２７（図５参照）で覆われる。   A power supply unit storage portion 26 recessed downward is continuous behind the raised portion 23 on the rear side of the under-seat floor 21, and the periphery of the upper surface opening of the power supply unit storage portion 26 constitutes the floor of the luggage space 18. Covered with a rear floor 27 (see FIG. 5).

次に、図３〜図８に基づいて電源ユニット１９の構造を説明する。   Next, the structure of the power supply unit 19 is demonstrated based on FIGS.

電源ユニット１９を収納するケーシングは容器状の下部樹脂ケース３１と概ね平坦な蓋状の上部樹脂ケース３２とで構成される。下部樹脂ケース３１の前部には、車体前方に向けて開口する３個のダクト状の冷却空気吸入通路３１ａ〜３１ｃと、車体左側方に向けて開口するダクト状の冷却空気吸入通路３１ｄとが一体に形成されるとともに、下部樹脂ケース３１の後部には、車幅方向に延びる二つの樋状の冷却空気排出通路３１ｅ，３１ｆが形成される。   The casing that houses the power supply unit 19 is composed of a container-shaped lower resin case 31 and a generally flat lid-shaped upper resin case 32. At the front of the lower resin case 31, there are three duct-shaped cooling air intake passages 31a to 31c that open toward the front of the vehicle body, and a duct-shaped cooling air intake passage 31d that opens toward the left side of the vehicle body. In addition to being formed integrally, at the rear part of the lower resin case 31, two bowl-shaped cooling air discharge passages 31e and 31f extending in the vehicle width direction are formed.

冷却空気吸入通路３１ａ〜３１ｃはリヤシート１６のシートクッション１４の後端に開口し、シートクッション１４の下面を通して車室内の空気を吸引する（図６参照）。また冷却空気吸入通路３１ｄはリヤシート１６のシートクッション１４の側部に開口し、そこから車室内の空気を吸引する。樋状の冷却空気排出通路３１ｅ，３１ｆは、その上面に結合される上部樹脂ケース３２との協働により、ダクトを構成する。   The cooling air intake passages 31a to 31c open at the rear end of the seat cushion 14 of the rear seat 16, and suck air in the vehicle compartment through the lower surface of the seat cushion 14 (see FIG. 6). The cooling air intake passage 31d opens at the side of the seat cushion 14 of the rear seat 16 and sucks air in the passenger compartment therefrom. The bowl-shaped cooling air discharge passages 31e and 31f constitute a duct by cooperation with the upper resin case 32 coupled to the upper surface thereof.

下部樹脂ケース３１の中間部には導風板３３が水平に固定されており、この導風板３３の後部に一体に形成されたモータ支持ブラケット３３ａに、軸流ファンよりなる冷却ファン３４を駆動する冷却ファン駆動モータ３５が支持される（図６参照）。下部ケース３１は冷却ファン３４の位置で細く括れており、その前側に大容積の電源ユニット収納室３６が形成され、その後側に前記冷却空気排出通路３１ｅ，３１ｆが連通する。従って、冷却ファン３４を通過して後方に案内された冷却空気は、左右の冷却空気排出通路３１ｅ，３１ｆに分岐する。   A wind guide plate 33 is fixed horizontally in the middle of the lower resin case 31, and a cooling fan 34 formed of an axial fan is driven by a motor support bracket 33 a formed integrally with the rear portion of the wind guide plate 33. The cooling fan drive motor 35 is supported (see FIG. 6). The lower case 31 is narrowly bundled at the position of the cooling fan 34, a large-capacity power supply unit storage chamber 36 is formed on the front side thereof, and the cooling air discharge passages 31e and 31f communicate with the rear side thereof. Accordingly, the cooling air guided rearward through the cooling fan 34 branches into the left and right cooling air discharge passages 31e and 31f.

電源ユニット１９は、４列３段に配置された合計１２本の円柱状のバッテリモジュール３７…を備えており、それらのバッテリモジュール３７…は上下に４分割されて２本のボルト３８，３８で締結された左右二組のバッテリホルダ３９…間に挟まれて束ねられる。このとき、最下段のバッテリホルダ３９の下面に導風板４０が積層され、前記ボルト３８…で共締めされる（図８参照）。最下段のバッテリモジュール３７…に対向する導風板４０の上面は、後方側が高くなるように、つまり最下段のバッテリモジュール３７…に接近するように傾斜している。   The power supply unit 19 includes a total of 12 cylindrical battery modules 37 arranged in four rows and three stages, and these battery modules 37 are divided into four parts in the vertical direction with two bolts 38 and 38. The battery holders 39 are sandwiched between two sets of left and right battery holders 39. At this time, the air guide plate 40 is laminated on the lower surface of the lowermost battery holder 39 and fastened together with the bolts 38 (see FIG. 8). The upper surface of the air guide plate 40 facing the lowermost battery modules 37 is inclined so that the rear side is higher, that is, closer to the lowermost battery modules 37.

更に、電源ユニット１９は、電気的に直列に接続されたバッテリモジュール３７…の高電圧を１２ボルトに降圧するＤＣ／ＤＣコンバータ４１と、バッテリモジュール３７…の直流電流を交流電流に変換してモータの駆動を制御するモータ駆動用インバータ（ＰＤＵ）４２と、プリント配線基板上に設けられた電子制御ユニット４３と、モータ駆動用インバータ４２用の平滑化コンデンサ４４…とを備えており、これらＤＣ／ＤＣコンバータ４１、モータ駆動用インバータ４２、電子制御ユニット４３および平滑化コンデンサ４４…は、上面が開放した容器状の下部金属ケース４５と、その上面に複数本のボルト４７…で結合される平坦な蓋状の上部金属ケース４６とで区画される空間に収納される。このように、電気的ノイズの発生要因となる高圧系の部品を下部金属ケース４５および上部金属ケース４６で囲まれた空間に収納することで、電気的ノイズが他の機器に及ぼす影響を除去することができる。   Further, the power supply unit 19 converts a DC / DC converter 41 that steps down the high voltage of the battery modules 37... Electrically connected in series to 12 volts, and converts a direct current of the battery modules 37. A motor driving inverter (PDU) 42 for controlling the driving of the motor, an electronic control unit 43 provided on the printed circuit board, and a smoothing capacitor 44 for the motor driving inverter 42. The DC converter 41, the motor drive inverter 42, the electronic control unit 43, and the smoothing capacitors 44 are flat and joined together by a container-like lower metal case 45 having an open upper surface and a plurality of bolts 47 on the upper surface. It is stored in a space defined by a lid-like upper metal case 46. In this way, by storing the high-voltage components that cause electrical noise in the space surrounded by the lower metal case 45 and the upper metal case 46, the influence of electrical noise on other devices is eliminated. be able to.

ＤＣ／ＤＣコンバータ４１およびモータ駆動用インバータ４２はそれぞれ車幅方向左側と右側とに並置されており、ＤＣ／ＤＣコンバータ４１の上方に電子制御ユニット４３が配置され、モータ駆動用インバータ４２の上面に３個の平滑化コンデンサ４４…が配置される。   The DC / DC converter 41 and the motor drive inverter 42 are juxtaposed on the left and right sides in the vehicle width direction, respectively, and an electronic control unit 43 is disposed above the DC / DC converter 41, and on the upper surface of the motor drive inverter 42. Three smoothing capacitors 44 are arranged.

左右のサイドフレーム４８，４８を車幅方向に架橋する２本の電源ユニット支持フレーム４９，４９の下面に前記下部金属ケース４５が複数本のボルト５０…で固定される。またバッテリモジュール３７…を束ねる左右二組のバッテリホルダ３９…が複数本のボルト５１…で下部金属ケース４５の下面に吊り下げ支持される。このとき、下部金属ケース４５の下面と最上段のバッテリモジュール３７…の上面との間に、発泡スチロール製のインシュレータ５２が挟持される。   The lower metal case 45 is fixed by a plurality of bolts 50 to the lower surfaces of the two power supply unit support frames 49, 49 that bridge the left and right side frames 48, 48 in the vehicle width direction. Further, two sets of left and right battery holders 39 for bundling the battery modules 37 are suspended and supported on the lower surface of the lower metal case 45 by a plurality of bolts 51. At this time, a polystyrene foam insulator 52 is sandwiched between the lower surface of the lower metal case 45 and the upper surface of the uppermost battery module 37.

このように、電源ユニット１９は、比較的に重量の大きいバッテリモジュール３７…が下側に配置され、それよりも重量の小さいＤＣ／ＤＣコンバータ４１やモータ駆動用インバータ４２がバッテリモジュール３７…の上側に配置されるので、電源ユニット１９の重心を低くして車両の安定性を高めることができる。   Thus, in the power supply unit 19, the relatively heavy battery modules 37 are arranged on the lower side, and the DC / DC converter 41 and the motor driving inverter 42, which are lighter than the battery modules 37, are arranged on the upper side of the battery modules 37. Therefore, the center of gravity of the power supply unit 19 can be lowered to improve the stability of the vehicle.

下部金属ケース４５にはＤＣ／ＤＣコンバータ４１の下面が臨む開口４５ａと、モータ駆動用インバータ４２の下面が臨む開口４５ｂとが形成されており、両開口４５ａ，４５ｂが臨むインシュレータ５２の上面には前後方向に延びる２本の導風溝５２ａ，５２ｂが形成される（図７参照）。ＤＣ／ＤＣコンバータ４１の下面に突出する多数の冷却フィン４１ａ…は下部金属ケース４５の開口４５ａを通過してインシュレータ５２の導風溝５２ａ内に突出し、モータ駆動用インバータ４２の下面に突出する多数の冷却フィン４２ａ…は下部金属ケース４５の開口４５ｂを通過してインシュレータ５２の導風溝５２ｂ内に突出する。   The lower metal case 45 is formed with an opening 45a facing the lower surface of the DC / DC converter 41 and an opening 45b facing the lower surface of the motor drive inverter 42, and on the upper surface of the insulator 52 facing both the openings 45a and 45b. Two air guide grooves 52a and 52b extending in the front-rear direction are formed (see FIG. 7). A number of cooling fins 41 a projecting from the lower surface of the DC / DC converter 41 pass through the opening 45 a of the lower metal case 45 and project into the air guide groove 52 a of the insulator 52, and project from the lower surface of the motor drive inverter 42. The cooling fins 42 a... Pass through the opening 45 b of the lower metal case 45 and project into the air guide groove 52 b of the insulator 52.

また最上段のバッテリモジュール３７…の上面に対向するインシュレータ５２の下面には車幅方向に延びる段部５２ｃが形成されており（図８参照）、この段部５２ｃの前側でバッテリモジュール３７…の上面とインシュレータ５２の下面との間の間隔が広く、後側で前記間隔が狭くなっている。   Further, a step 52c extending in the vehicle width direction is formed on the lower surface of the insulator 52 facing the upper surface of the uppermost battery module 37 ... (see FIG. 8), and the battery module 37 ... The space between the upper surface and the lower surface of the insulator 52 is wide, and the space is narrow on the rear side.

３段に積層したバッテリモジュール３７…の右側面に四角形の板状の高圧配電盤５３が配置される。高圧配電盤５３の上部は最上段のバッテリモジュール３７…の上面よりも上方に延出する延出部５３ａとなっており、この延出部５３ａの左側面はモータ駆動用インバータ４２の右側面に近接して対向する位置に延びている。そして高圧配電盤５３の延出部５３ａと平滑化コンデンサ４４…とが一対の端子５４，５４により接続される。また高圧配電盤５３の右側面には、バッテリモジュール３７…からの電流をＯＮ／ＯＦＦするコンタクタ５５と、バッテリモジュール３７…に対して流入あるいは流出する電流を検出する電流センサ５６が設けられる。   A rectangular plate-shaped high voltage switchboard 53 is disposed on the right side of the battery modules 37 stacked in three stages. The upper portion of the high-voltage switchboard 53 is an extending portion 53a that extends upward from the upper surface of the uppermost battery module 37, and the left side surface of the extending portion 53a is close to the right side surface of the motor drive inverter 42. And extend to opposite positions. And the extension part 53a of the high voltage switchboard 53 and the smoothing capacitors 44 are connected by a pair of terminals 54, 54. Further, on the right side surface of the high voltage switchboard 53, there are provided a contactor 55 for turning on / off the current from the battery modules 37, and a current sensor 56 for detecting a current flowing into or out of the battery modules 37.

このように構成された電源ユニット１９は下部樹脂ケース３１の内部に収納され、その上面開口部を覆う上部樹脂ケース３２が複数本のボルト５７…で固定される。この状態で上部樹脂ケース３２はリヤフロア２７と同じ高さになり、それらは協働してラッゲージスペース１８の床面を構成する。   The power unit 19 configured as described above is housed in the lower resin case 31, and the upper resin case 32 covering the upper surface opening is fixed by a plurality of bolts 57. In this state, the upper resin case 32 is at the same height as the rear floor 27, and they cooperate to form the floor surface of the luggage space 18.

次に、上記構成を備えた本発明の実施の形態の作用について説明する。   Next, the operation of the embodiment of the present invention having the above configuration will be described.

電源ユニット１９から供給される電流で走行用モータを駆動すると、電源ユニット１９のバッテリモジュール３７…、ＤＣ／ＤＣコンバータ４１、モータ駆動用インバータ４２等が発熱するため、冷却ファン３４をファン駆動モータ３５で駆動することで発生する冷却空気によりそれらを冷却する。   When the driving motor is driven by the current supplied from the power supply unit 19, the battery modules 37,..., The DC / DC converter 41, the motor driving inverter 42, etc. of the power supply unit 19 generate heat. They are cooled by the cooling air generated by driving at.

図６に示すように、冷却ファン３４が回転すると下部樹脂ケース３１および上部樹脂ケース３２により区画された電源ユニット収納室３６に負圧が発生し、４個の冷却空気吸入通路３１ａ〜３１ｄから車室内の空気が電源ユニット収納室３６に吸入される。この冷却空気は電源ユニット収納室３６の内部でインシュレータ５２を境にして上下に分流し、下側に流れた冷却空気は４列３段に配置された合計１２本バッテリモジュール３７…間の隙間を後方に流れ、その間にバッテリモジュール３７…を冷却する。   As shown in FIG. 6, when the cooling fan 34 rotates, negative pressure is generated in the power supply unit storage chamber 36 defined by the lower resin case 31 and the upper resin case 32, and the vehicle is discharged from the four cooling air intake passages 31 a to 31 d. Indoor air is sucked into the power supply unit storage chamber 36. This cooling air is divided up and down inside the power supply unit storage chamber 36 with the insulator 52 as a boundary, and the cooling air that has flowed downward forms gaps between a total of twelve battery modules 37 arranged in four rows and three stages. The battery modules 37 are cooled while flowing backward.

このとき、図８に示すように、最下段のバッテリモジュール３７…の下面に対向する導風板４０が後ろ上がりに傾斜しており、かつ最上段のバッテリモジュール３７…の上面に対向するインシュレータ５２の下面に段部５２ｃが形成されているため、電源ユニット収納室３６の下流側の流路断面積が絞られて冷却空気の流速が高められる。これにより冷却され難い下流側のバッテリモジュール３７…を効率的に冷却し、全てのバッテリモジュール３７…を均一に冷却することができる。   At this time, as shown in FIG. 8, the air guide plate 40 facing the lower surface of the lowermost battery modules 37... Is inclined rearward and the insulator 52 facing the upper surface of the uppermost battery modules 37. Since the stepped portion 52c is formed on the lower surface, the flow passage cross-sectional area on the downstream side of the power supply unit storage chamber 36 is reduced, and the flow velocity of the cooling air is increased. As a result, the downstream battery modules 37 that are difficult to be cooled can be efficiently cooled, and all the battery modules 37 can be uniformly cooled.

また図６、図７および図９に示すように、インシュレータ５２の上側に分流した冷却空気は、インシュレータ５２の上面に前後方向に形成した左右の導風溝５２ａ，５２ｂに分かれて前から後に流れ、その一方は下部金属ケース４５の開口４５ａから下向きに突出するＤＣ／ＤＣコンバータ４１の冷却フィン４１ａ…に接触して該ＤＣ／ＤＣコンバータ４１を冷却し、その他方は下部金属ケース４５の開口４５ｂから下向きに突出するモータ駆動用インバータ４２の冷却フィン４２ａ…に接触して該モータ駆動用インバータ４２を冷却する。   As shown in FIGS. 6, 7, and 9, the cooling air divided to the upper side of the insulator 52 flows into the left and right air guide grooves 52 a and 52 b formed in the front-rear direction on the upper surface of the insulator 52 and flows from the front to the rear. One of them contacts the cooling fins 41a of the DC / DC converter 41 protruding downward from the opening 45a of the lower metal case 45 to cool the DC / DC converter 41, and the other is the opening 45b of the lower metal case 45. The motor driving inverter 42 is cooled by contacting the cooling fins 42a of the motor driving inverter 42 projecting downward from the motor 42.

このようにして電源ユニット１９を冷却した冷却空気は再び合流して冷却ファン３４を通過した後、冷却ファン３４の後方の左右の冷却空気排出通路３１ｅ，３１ｆに分岐する。車幅方向左側および右側に分岐した左右の冷却空気排出通路３１ｅ，３１ｆの下流端は、ラッゲージスペース１８の内張りとリヤフェンダーとの間の空間に流入し、一部が車外に排出されて一部が車室内に戻される。このとき、排気騒音が車室内に伝わらないように、冷却空気排出通路３１ｅ，３１ｆにサイレンサを設けても良い。   The cooling air that has cooled the power supply unit 19 in this manner joins again and passes through the cooling fan 34, and then branches to the left and right cooling air discharge passages 31e and 31f behind the cooling fan 34. The downstream ends of the left and right cooling air discharge passages 31e and 31f branched to the left and right sides in the vehicle width direction flow into the space between the lining of the luggage space 18 and the rear fender, and part of the downstream end is discharged outside the vehicle. Is returned to the passenger compartment. At this time, silencers may be provided in the cooling air discharge passages 31e and 31f so that the exhaust noise is not transmitted to the vehicle interior.

リヤフロア２７に形成した電源ユニット収納部２６は、通常はスペアタイヤの収納部として使用される空間であり、この空間を利用して電源ユニット１９を収納することにより、リヤシート１６の後方のラッゲージスペース１８を圧迫することがない。また電源ユニット１９を収納する下部樹脂ケース３１の上面開口部を覆う上部樹脂ケース３２は、リヤフロア２７と同一平面上に連なってラッゲージスペース１８の平坦な床面を構成するため、ラッゲージスペース１８の使い勝手が向上する。   The power supply unit storage portion 26 formed on the rear floor 27 is a space that is normally used as a spare tire storage portion. By storing the power supply unit 19 using this space, a luggage space 18 behind the rear seat 16 is provided. There is no pressure. In addition, the upper resin case 32 that covers the upper surface opening of the lower resin case 31 that houses the power supply unit 19 is connected to the same plane as the rear floor 27 to form a flat floor surface of the luggage space 18. Will improve.

また束ねられた１２本のバッテリモジュール３７…の上部にＤＣ／ＤＣコンバータ４１およびモータ駆動用インバータ４２を左右に振り分けて配置し、ＤＣ／ＤＣコンバータ４１の上部に電子制御ユニット４３を支持してモータ駆動用インバータ４２の上部に平滑化コンデンサ４４…を支持し、更にそれらの側面に高圧配電盤５３を配置したので、電源ユニット１９をコンパクト化してリヤフロア２７に形成した電源ユニット収納部２６に容易に収納することができるだけでなく、それらを相互に接続するケーブルを廃止したり最短化することができる。例えば、高圧配電盤５３にコンタクタ５５を設けることで、バッテリモジュール３７…とモータ駆動用インバータ４２とを接続するケーブルを廃止したり、高圧配電盤５３に延出部５３ａを形成することで、その延出部５３ａと平滑化コンデンサ４４…とをケーブルを用いずに端子５４，５４で接続することができる。   In addition, a DC / DC converter 41 and a motor driving inverter 42 are arranged on the upper side of the twelve battery modules 37... And the electronic control unit 43 is supported on the upper part of the DC / DC converter 41 to support the motor. Since the smoothing capacitors 44 are supported on the upper part of the drive inverter 42 and the high-voltage switchboard 53 is arranged on the side surfaces thereof, the power supply unit 19 is made compact and easily housed in the power supply unit housing portion 26 formed on the rear floor 27. Not only can you do this, you can eliminate or minimize the cables that connect them together. For example, by providing the contactor 55 on the high-voltage switchboard 53, the cable connecting the battery modules 37... And the motor drive inverter 42 can be eliminated, or the extension part 53 a can be formed on the high-voltage switchboard 53. The part 53a and the smoothing capacitors 44 can be connected by the terminals 54, 54 without using a cable.

また下部樹脂ケース３１内の電源ユニット収納室３６に吸入された冷却空気は、上下に分流して下側のバッテリモジュール３７…と、上側のＤＣ／ＤＣコンバータ４１およびモータ駆動用インバータ４２とをパラレルに冷却するので、それらバッテリモジュール３７…、ＤＣ／ＤＣコンバータ４１およびモータ駆動用インバータ４２に熱交換前の低温の冷却空気を接触させて均等に冷却することができ、しかも冷却空気の圧損を最小限に抑えることができる。これにより、冷却ファン３４に高価は遠心ファン（例えば、シロッコファン）を用いることなく、安価な軸流ファンを用いるだけで充分な冷却性能を確保することが できる。   The cooling air sucked into the power supply unit storage chamber 36 in the lower resin case 31 is divided in the vertical direction, and the lower battery module 37..., The upper DC / DC converter 41 and the motor driving inverter 42 are paralleled. Therefore, the low temperature cooling air before heat exchange can be brought into contact with the battery modules 37,..., The DC / DC converter 41, and the motor driving inverter 42 so as to evenly cool, and the pressure loss of the cooling air is minimized. To the limit. Accordingly, sufficient cooling performance can be ensured by using an inexpensive axial flow fan without using an expensive centrifugal fan (for example, a sirocco fan) for the cooling fan 34.

仮に、バッテリモジュール３７…、ＤＣ／ＤＣコンバータ４１およびモータ駆動用インバータ４２をシリーズに冷却する場合には、上流側の配置された機器の冷却効果は向上するが、下流側の配置された機器の冷却効果が低下してしまう問題があり、しかも冷却空気の圧損が増加するために、冷却ファン３４や冷却ファン駆動モータ３５に高性能のものが必要になってコストアップの要因となる問題がある。   If the battery modules 37..., The DC / DC converter 41, and the motor drive inverter 42 are cooled in series, the cooling effect of the devices arranged on the upstream side is improved, but the devices arranged on the downstream side are improved. There is a problem that the cooling effect is lowered, and the pressure loss of the cooling air is increased, so that a high performance fan is required for the cooling fan 34 and the cooling fan drive motor 35, which causes a cost increase. .

また冷却ファン３４を通過した後の冷却空気が流れる冷却空気排出通路３１ｅ、３１ｆを二股に分岐させたで、冷却空気排出通路３１ｅ、３１ｆのトータルの流路断面積を充分に確保し、冷却ファン３４の背圧を低下させて冷却ファン駆動モータ３５の負荷を更に低減することができる。しかも前記冷却空気排出通路３１ｅ、３１ｆは上部樹脂ケース３２の下面、つまりリヤフロア２７の下面に形成されるので、ラッゲージスペース１８の容積を圧迫することがない。   Further, since the cooling air discharge passages 31e and 31f through which the cooling air after passing through the cooling fan 34 branches are bifurcated, a sufficient total cross-sectional area of the cooling air discharge passages 31e and 31f is secured, and the cooling fan The load on the cooling fan drive motor 35 can be further reduced by lowering the back pressure of 34. Moreover, since the cooling air discharge passages 31e and 31f are formed on the lower surface of the upper resin case 32, that is, the lower surface of the rear floor 27, the volume of the luggage space 18 is not compressed.

以上、本発明の実施の形態を説明したが、本発明はその要旨を逸脱しない範囲で種々の設計変更を行うことが可能である。   The embodiments of the present invention have been described above, but various design changes can be made without departing from the scope of the present invention.

例えば、実施の形態では走行用駆動源としてエンジンおよびモータを備えたハイブリッド車両を例示したが、本発明は走行用駆動源としてモータだけを備えた電気自動車に対しても適用することができる。   For example, in the embodiment, a hybrid vehicle including an engine and a motor as a driving source for traveling is illustrated, but the present invention can also be applied to an electric vehicle including only a motor as a driving source for traveling.

ハイブリッド車両の全体側面図Overall side view of hybrid vehicle 図１の要部拡大図1 is an enlarged view of the main part 樹脂ケースおよび電源ユニットの分解斜視図Disassembled perspective view of resin case and power supply unit 電源ユニットの分解斜視図Exploded perspective view of the power supply unit 図２の５方向矢視図5 direction arrow view of FIG. 図５の６−６線断面図6-6 sectional view of FIG. 図６の７−７線断面図Sectional view along line 7-7 in FIG. 図７の８−８線断面図Sectional view taken along line 8-8 in FIG. 電源ユニット冷却の作用説明図Power supply unit cooling explanatory diagram

符号の説明Explanation of symbols

１６ リヤシート（シート）
１９ 電源ユニット（電気機器）
２７ リヤフロア（フロア）
３７ バッテリモジュール（バッテリ）
４１ ＤＣ／ＤＣコンバータ
４２ モータ駆動用インバータ
４４ 平滑化コンデンサ
４５ 下部金属ケース（金属ケース）
４６ 上部金属ケース（金属ケース）
５３ 高圧配電盤
５３ａ 延出部
５５ コンタクタ
16 Rear seat (seat)
19 Power supply unit (electric equipment)
27 Rear floor (floor)
37 Battery module (battery)
41 DC / DC converter 42 Motor drive inverter 44 Smoothing capacitor 45 Lower metal case (metal case)
46 Upper metal case (metal case)
53 High Voltage Switchboard 53a Extension 55 Contactor

Claims (4)

走行用モータを駆動するためのバッテリ（３７）、ＤＣ／ＤＣコンバータ（４１）およびモータ駆動用インバータ（４２）を含む電気機器（１９）をシート（１６）の後方のフロア（２７）の下方に配置し、その電気機器（１９）を冷却空気で冷却する車両における電気機器の冷却構造であって、
前記バッテリ（３７）の上部に前記ＤＣ／ＤＣコンバータ（４１）および前記モータ駆動用インバータ（４２）を車幅方向に並置し、車体前方から後方に流れる冷却空気は上下に分かれ、下側の前記バッテリ（３７）と、上側の前記ＤＣ／ＤＣコンバータ（４１）および前記モータ駆動用インバータ（４２）とをパラレルに冷却することを特徴とする、車両における電気機器の冷却構造。 An electric device (19) including a battery (37) for driving the traveling motor, a DC / DC converter (41), and a motor driving inverter (42) is placed below the floor (27) behind the seat (16). A cooling structure for an electric device in a vehicle that is arranged and cools the electric device (19) with cooling air,
The DC / DC converter (41) and the motor drive inverter (42) are juxtaposed in the vehicle width direction above the battery (37), and the cooling air flowing from the front to the rear of the vehicle body is divided into upper and lower parts. A cooling structure for electric equipment in a vehicle, wherein the battery (37), the upper DC / DC converter (41), and the motor drive inverter (42) are cooled in parallel. 前記バッテリ（３７）の車幅方向一側に高圧配電盤（５３）を配置し、この高圧配電盤（５３）の延出部（５３ａ）を前記バッテリ（３７）の上端から上方に延出させ、前記延出部（５３ａ）を前記ＤＣ／ＤＣコンバータ（４１）または前記モータ駆動用インバータ（４２）に設けた平滑化コンデンサ（４４）に接続したことを特徴とする、請求項１に記載の車両における電気機器の冷却構造。   A high-voltage switchboard (53) is arranged on one side in the vehicle width direction of the battery (37), and an extension part (53a) of the high-voltage switchboard (53) is extended upward from the upper end of the battery (37), 2. The vehicle according to claim 1, wherein the extension portion (53 a) is connected to a smoothing capacitor (44) provided in the DC / DC converter (41) or the motor drive inverter (42). Cooling structure for electrical equipment. 前記高圧配電盤（５３）に前記バッテリ（３７）からの電流を遮断するコンタクタ（５５）を配置したことを特徴とする、請求項２に記載の車両における電気機器の冷却構造。   The cooling structure for electric equipment in a vehicle according to claim 2, wherein a contactor (55) for cutting off a current from the battery (37) is arranged on the high-voltage switchboard (53). 前記ＤＣ／ＤＣコンバータ（４１）および前記モータ駆動用インバータ（４２）は車体に固定された共通の金属ケース（４５，４６）に収納され、この金属ケース（４５，４６）の下面に前記バッテリ（３７）を支持したことを特徴とする、請求項１〜請求項４の何れか１項に記載の車両における電気機器の冷却構造。
The DC / DC converter (41) and the motor drive inverter (42) are accommodated in a common metal case (45, 46) fixed to the vehicle body, and the battery (45, 46) is placed on the lower surface of the metal case (45, 46). 37. The cooling structure for an electric device in a vehicle according to any one of claims 1 to 4, wherein 37) is supported.
JP2006242488A 2006-09-07 2006-09-07 Cooling structure for electrical equipment in vehicles Expired - Fee Related JP4832225B2 (en)

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EP20070115723 EP1897739B1 (en) 2006-09-07 2007-09-05 Electrical device cooling structure in vehicle
DE200760010216 DE602007010216D1 (en) 2006-09-07 2007-09-05 Cooling structure of an electrical device in a vehicle
CN2007101497469A CN101138963B (en) 2006-09-07 2007-09-05 Electrical device cooling structure in vehicle
CN2010105982431A CN102050009B (en) 2006-09-07 2007-09-05 Electrical device cooling structure in vehicle
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