JP2004327142A - Cooling device of battery pack - Google Patents

Cooling device of battery pack Download PDF

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Publication number
JP2004327142A
JP2004327142A JP2003117859A JP2003117859A JP2004327142A JP 2004327142 A JP2004327142 A JP 2004327142A JP 2003117859 A JP2003117859 A JP 2003117859A JP 2003117859 A JP2003117859 A JP 2003117859A JP 2004327142 A JP2004327142 A JP 2004327142A
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Japan
Prior art keywords
cooling
passage
cooling air
opening
battery pack
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JP2003117859A
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JP4359444B2 (en
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Shinya Kimoto
進弥 木本
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Primearth EV Energy Co Ltd
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Panasonic EV Energy Co Ltd
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

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Abstract

<P>PROBLEM TO BE SOLVED: To provide a cooling device of a battery pack in which noise can be suppressed effectively without possibility of reduction of cooling performance and failure/breakage. <P>SOLUTION: In the cooling device of the battery pack provided with a cooling air carry and feed means to carry and feed the cooling air into each cooling passage 3 of the battery pack 1 composed by arranging in parallel by spacing the cooling passage 3 between a plurality of secondary batteries 2, an opening group 26 of a network shape is formed on a wall face of an exhaust duct 18 which is a cooling air duct to carry and feed or exhaust the cooling air against the cooling passage 3, an inflow side distribution space and an outflow side collective space, and a sound absorbing material 27 is pasted on the outer face of the exhaust duct 18 so as to cover this opening group 26. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

【０００１】
【発明の属する技術分野】
本発明は組電池の冷却装置に関し、特に冷却風の流れによる騒音の抑制を図った組電池の冷却装置に関するものである。
【０００２】
【従来の技術】
従来から、複数の二次電池から成る組電池において、充放電に伴う発熱で二次電池温度が上昇し、電池出力や充放電効率や電池寿命が低下するのを防止するため、複数の二次電池を各々の間に冷却風を通す冷却通路を介して並列配置して組電池を構成し、その組電池の冷却通路に向けて冷却風を送給する冷却風送給手段を設けた組電池の冷却装置は知られている（例えば、特許文献１参照。）。
【０００３】
また、燃料電池発電プラントにおいて、電動機の騒音が外部に漏れるのを抑制するため、そのフレームの外面を覆う天井板や側壁板を、金属板から成るパネルの内面に吸音材を配設した複合パネルにて構成したものが知られている（例えば、特許文献２参照。）。
【０００４】
そこで、上記組電池の冷却装置において、組電池の冷却通路に冷却風を送給又は排出する冷却風ダクトからの騒音を防止するために、金属製又は合成樹脂製の冷却風ダクトの内面に吸音材を貼付けることが考えられている。
【０００５】
具体構成例を、図４を参照して説明すると、３１は組電池の上部の集合排気空間上に配設されたクロスフロー型の排気ファンの吐出口に接続される排気ダクトであり、入口側の断面形状は扁平な長方形状であり、出口側に向けて一側方に屈曲させつつ流路を絞って円形の流路断面となるように形成されている。３２は入口側の長方形断面部の強度を確保するために上下壁面間を連結するように適当間隔あけて設けられた補強柱である。このような形状の排気ダクト３１では、流路屈曲部の内周側や流路断面形状の変換部で渦流が発生し、また流路断面の狭窄による流速の急激な変化によって高周波の騒音を発生することになる。そこで、排気ダクト３１の内面のほぼ全面に発泡合成樹脂から成る吸音材３３が貼付けられている。
【０００６】
【特許文献１】
特開２００１−１６７８０３号公報
【０００７】
【特許文献２】
特開平１０−２８９７２５号公報
【０００８】
【発明が解決しようとする課題】
ところで、図４に示したような構成の排気ダクト３１を用いた場合、その内面に肉厚の吸音材３３を貼付けているため、排気ダクト３１の流路断面積が減少し、圧損が大きくなって冷却風の流量が減少し、冷却能力が低下して電池温度が上昇し、電池寿命が低下するという問題がある。また、万一にも吸音材３３が剥がれた場合には、排気ダクト３１の流路が詰まってしまって冷却装置の故障・破損を来してしまい、組電池の使用が不可能になってしまうという問題がある。
【０００９】
本発明は、上記従来の問題点に鑑み、冷却性能の低下や故障・破損の恐れ無しに騒音を効果的に抑制できる組電池の冷却装置を提供することを目的とする。
【００１０】
【課題を解決するための手段】
本発明の組電池の冷却装置は、複数の二次電池を各々の間に冷却通路をあけて並列配置して成る組電池の各冷却通路に冷却風を送給する冷却風送給手段を備えた組電池の冷却装置において、冷却通路に対して冷却風を送給又は排出する、冷却風ダクト、流入側分配空間及び流出側集合空間のうちの少なくとも一つの壁面に開口を形成し、その開口を覆うように前記壁面の外面に吸音材を貼付けたものであり、発生した音波エネルギーを開口を通して吸音材にて吸収することで騒音を効果的に抑制することができ、かつ壁面の外面に吸音材を貼付けているので流路断面積を大きくとれ、吸音材の貼付けによる圧損を無くして冷却風の流量を確保でき、高い冷却能力を維持して電池寿命を向上できる。また、万一にも吸音材が剥がれた場合にも流路を塞ぐことがなく、冷却装置の故障・破損を来す恐れがなく、また壁面の外面に吸音材を貼付けるだけで良いので、コスト低下を図ることができる。
【００１１】
また、開口を冷却風ダクトの屈曲流路部の内周側に形成すると、屈曲流路部の内周側は渦流が発生して騒音が発生し易いが、その音波エネルギーが開口を通して吸音材にて効果的に吸収されることで防音効果が効果的に発揮される。
【００１２】
また、開口を冷却風ダクトの流路狭窄部に形成すると、流路狭窄部で冷却風の流速が急激に高くなることで騒音が発生し易いが、その音波エネルギーが開口を通して吸音材にて効果的に吸収されることで防音効果が効果的に発揮される。
【００１３】
また、開口が所定領域に網目状に形成した開口群から成ると、冷却風ダクトの強度及び吸音材の貼付強度を確保しつつ騒音の音波エネルギーを開口群から吸音材に効果的に吸収させることができる。
【００１４】
また、吸音材が連続気泡を有する発泡合成樹脂から成ると、吸音材を発泡合成樹脂にて軽量安価に構成できかつその連続気泡内を音波が伝播する間にそのエネルギーを効果的に吸収できるため、高い防音効果を得ることができる。
【００１５】
また、冷却通路からの冷却風を排出する排気ダクトの流路断面積が狭窄する部分の近傍に分岐開口を形成すると、流路断面の狭窄部の近傍で冷却風を分流させて流路断面の狭窄部で冷却風の流速が急激に高くなるのを防止できて、騒音の発生を抑制することができる。
【００１６】
また、分岐開口を冷却通路に向けて冷却風を送給する通路に接続すると、冷却風が吸引して分流されるので効果的に騒音の発生を抑制することができ、かつ冷却風が排気ダクトの出口以外の周囲環境に放出されないため、二次電池から放出されて冷却風中に混入した水素ガスなどが周囲環境に溜まる恐れも無くすことができる。なお、還流させる冷却風は組電池を冷却した後の温度の高い冷却風であるため、還流させる冷却風の流量は組電池の冷却性能に悪影響を与えない程度に設定する必要がある。
【００１７】
また、複数の二次電池を各々の間に冷却通路をあけて並列配置して成る組電池の各冷却通路に冷却風を送給する冷却風送給手段を備えた組電池の冷却装置において、冷却通路からの冷却風を排出する排気ダクトの流路断面積が狭窄する部分、屈曲流路部分、異物混入防止用メッシュ部分及びルーバー部分のうちの何れかの１又は複数の部分の近傍に分岐開口を形成すると、上記冷却風を分流させることによって騒音を抑制する効果を、排気ダクトの流路断面積の狭窄部分や異物混入防止用メッシュ部分やルーバー部分で奏することができ、さらに分岐開口を冷却通路に向けて冷却風を送給する通路に接続すると、冷却風が吸引して分流されるので効果的に騒音の発生を抑制することができ、かつ二次電池から放出されて冷却風中に混入した水素ガスなどが周囲環境に溜まるのを防止できる。
【００１８】
【発明の実施の形態】
以下、本発明の組電池の冷却装置の一実施形態について、図１〜図３を参照して説明する。
【００１９】
１は、ハイブリッド車を含む電気自動車用の駆動電源としての組電池で、１０〜３０個の扁平な角形の二次電池２を、その長側面間に冷却通路３をあけて並列配置し、並列方向の両端に配設した一対の端板４で挟持し、拘束部材（図示せず）にて一体的に固定して構成されている。各二次電池２は、長側面の長手方向に複数の単電池を並列配置するとともに単電池同士を内部で直列接続した電池モジュールとして構成され、組電池１はこれらの二次電池２の両端の接続端子２ａをバス・バー（図示せず）にて順次直列に接続することで所定の出力電圧を得ている。
【００２０】
組電池１は、各二次電池２の長手方向両端部が支持フレーム５にて支持され、支持フレーム５、５間の下部には下部ケース６が配設され、この下部ケース６にて組電池１の下面に隣接して各冷却通路３に冷却風を均等に分配送給する流入側分配空間７が形成されている。また、支持フレーム５、５間の上部は、上部ケース８にて組電池１が覆われるとともに、この上部ケース８に組電池１の上面に隣接して各冷却通路３から流出した冷却風を集合して排出する流出側集合空間９が突出形成され、その上面に排出開口９ａが形成されている。
【００２１】
上部ケース８上には、クロスフロー型のファン１０がその軸芯を組電池１の二次電池２並列方向に沿わせて配設され、その吸込口１０ａが上部ケース８の排出開口９ａに接合されている。ファン１０は、ファンケース１１内に略円筒状の羽根車１２を回転自在に配設するとともに、その軸芯方向一端に連結したモータ１３にて回転駆動可能に構成されている。また、羽根車１２の外周の一側にスタビライザ１４が配設されている。このスタビライザ１４の先端から斜め下方に向けて排風路壁兼吸込チャンバ壁１７が延出され、その先端が上部ケース８の排出開口９ａの周縁部に接合されている。この排風路壁兼吸込チャンバ壁１７にて下部の吸込チャンバ１５と上部の排風路１６が区画形成されている。ファン１０の吸込口１０ａは吸込チャンバ１５の下面開口にて構成され、ファン１０の吐出口１０ｂは排風路１６の一側開口にて構成されている。
【００２２】
１８は排気ダクトで、その一端開口がファン１０の吐出口１０ｂに接合され、他端は車外に開口されている。また、流入側分配空間７の一端には、吸気ダクト１９の一端が接続され、吸気ダクト１９の他端は例えば車室内のエアを取り込むように構成されている。
【００２３】
排気ダクト１８は、ファン１０の吐出口１０ｂに接続された断面形状が略長方形状の入口ダクト部２０と、その一側部から屈曲させて延出された角筒状ないし円筒状の中間ダクト部２１と、中間ダクト部２１を介してクランク状に屈曲させて延出された出口ダクト部２２にて構成され、入口ダクト部２０と中間ダクト部２１の間に屈曲流路部２３が、中間ダクト部２１と出口ダクト部２２の間の屈曲流路部２４の手前に流路断面積を絞る流路狭窄部２５が形成されている。
【００２４】
屈曲流路部２３の内周側と、流路狭窄部２５の外周全周と、屈曲流路部２４の内周側には、網目状の開口群２６が形成され、その外面に開口群２６の開口を覆うように吸音材２７が貼付けられている。吸音材２７は、連続気泡を有するとともに外面に外皮を形成した発泡合成樹脂にて構成されている。
【００２５】
以上の構成によれば、吸気ダクト１９を通して冷却風がファン１０によって吸引送給され、組電池１の冷却通路３を通過して各二次電池２を冷却した後、その冷却風が排気ダクト１８を通過する際に、屈曲流路部２３で渦流を発生したり、流路狭窄部２５で急激に流速が高くなったりして、高周波騒音を発生するが、その音波エネルギーは開口群２６を通して吸音材２７にて吸収されるので、排気ダクト１８から外部に放出される騒音を効果的に抑制することができる。また、排気ダクト１８の外面に吸音材２７を貼付ける構成であるため、従来のように内面に貼付ける場合に比して排気ダクト１８の流路断面積を大きくとれ、吸音材２７の貼付けによる圧損を無くして冷却風の流量を確保でき、高い冷却能力を維持して電池寿命を向上できる。
【００２６】
また、万一にも吸音材２７が剥がれた場合にも流路を塞ぐことがないので、冷却装置の故障・破損を来す恐れがなく、また排気ダクト１８の外面に吸音材を貼付けるだけで良いので、製作コストの低下を図ることができる。
【００２７】
また、吸音材２７を流路に臨ませる開口を網目状の開口群２６にて構成しているので、大きく単一又は少数の開口を形成した場合に比して排気ダクト１８の強度及び吸音材２７の貼付強度を確保することができるとともに、騒音の音波エネルギーは開口群２６から吸音材２７に効果的に吸収させて高い騒音抑制効果が得られる。
【００２８】
また、吸音材２７を連続気泡を有する発泡合成樹脂にて構成しているので、発泡合成樹脂にて軽量安価に構成できかつその連続気泡内を音波が伝播する間にそのエネルギーを効果的に吸収でき、高い防音効果を得ることができる。また、吸音材２７の外面に外皮を形成したものを用いると、外皮によって吸収されなかった音波が外部に伝播するのを防止できるため、一層高い防音効果を得ることができる。
【００２９】
なお、上記実施形態の説明では、開口群２６を形成してその外面に吸音材２７を貼り付けて防音するようにしたが、図３及び図１に仮想線で示すように、排気ダクト１８の流路狭窄部２５の近傍に分岐開口２８を形成し、この分岐開口２８と吸気ダクト１９を分岐通路２９にて接続し、流路狭窄部２５を通過する冷却風の一部を吸気側に還流させるようにしても良い。
【００３０】
この構成によれば、流路狭窄部２５の近傍で分岐開口２８から冷却風を分流させることにより、この流路狭窄部２５において冷却風の流速が急激に高くなるのを防止して騒音の発生を抑制することができる。また、分岐開口２８を分岐通路２９にて吸気ダクト１９に接続して冷却風を吸引して分流することにより、効果的に騒音の発生を抑制することができる。なお、分岐通路２９にて還流させる冷却風は組電池１を冷却した後の温度の高い冷却風であるため、その流量は組電池１の冷却性能に悪影響を与えない程度に設定する必要がある。
【００３１】
また、この分岐開口２８や分岐通路２９を単独で設けるだけでも騒音防止を図ることはできるが、本実施形態のように開口群２６及び吸音材２７と併用して設けるのが好適である。
【００３２】
さらに、図１に示すように、排気ダクト１８の出口に至る途中の流路断面積が狭窄する部分や屈曲流路部分に別に分岐開口２８ａを設けたり、排気ダクト１８の出口のルーバー部分３０や雨水などの異物混入防止用メッシュ部分（図示せず）の近傍に分岐開口２８ｂを設けてもよく、そうすることで上記と同様に冷却風を分流させることによって騒音を抑制することができる。また、これら分岐開口２８ａ、２８ｂについても吸気ダクト１９に接続すると、冷却風が吸引して分流されるので、小さい分岐開口を形成するだけで効果的に騒音の発生を抑制することができる。
【００３３】
また、以上の実施形態の説明では、ファン１０を排気側に設け、組電池１の冷却通路３に対して冷却風を吸引して流通させるようにした例について説明したが、送給側にファンを設けて組電池１の冷却通路３に対して冷却風を圧送して流通させるようにしても良い。また、何れの場合においても、上記実施形態に示した排気ダクト１８側に限らず、送給ダクト側や、排気ダクトと送給ダクトの両方や、さらに流入側分配空間７や流出側集合空間９において、その屈曲流路部や狭窄流路部に開口を設け、その外面に吸音材を貼付けることにより、騒音を抑制する効果を奏することができる。
【００３４】
【発明の効果】
本発明の組電池の冷却装置によれば、冷却通路に対して冷却風を送給又は排出する、冷却風ダクト、流入側分配空間及び流出側集合空間のうちの少なくとも一つの壁面に開口を形成し、その開口を覆うように前記壁面の外面に吸音材を貼付けたので、発生した音波エネルギーを開口を通して吸音材にて吸収することで騒音を効果的に抑制することができ、かつ壁面の外面に吸音材を貼付けているので流路断面積を大きくとれ、吸音材の貼付けによる圧損を無くして冷却風の流量を確保でき、高い冷却能力を維持して電池寿命を向上でき、また万一にも吸音材が剥がれた場合にも流路を塞ぐことがなく、冷却装置の故障・破損を来す恐れがなく、また壁面の外面に吸音材を貼付けるだけで良いので、コスト低下を図ることができる等の効果が発揮される。
【図面の簡単な説明】
【図１】本発明の組電池の冷却装置の一実施形態の縦断正面図である。
【図２】図１のＡ−Ａ矢視断面図である。
【図３】同実施形態における要部構成の分解斜視図である。
【図４】従来例の組電池の冷却装置の要部構成の排気ダクトを示し、（ａ）は斜視図、（ｂ）は（ａ）のＢ−Ｂ矢視断面図、（ｃ）は（ａ）のＣ−Ｃ矢視断面図である。
【符号の説明】
１ 組電池
２ 二次電池
３ 冷却通路
１８ 排気ダクト
２３ 屈曲流路部
２５ 流路狭窄部
２６ 開口群
２７ 吸音材
２８、２８ａ、２８ｂ 分岐開口
２９ 分岐通路[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a battery pack cooling device, and more particularly, to a battery pack cooling device that suppresses noise due to the flow of cooling air.
[0002]
[Prior art]
Conventionally, in an assembled battery composed of a plurality of secondary batteries, a plurality of secondary batteries are used to prevent the temperature of the secondary batteries from rising due to heat generated by charging / discharging, thereby lowering battery output, charging / discharging efficiency, and battery life. A battery pack is formed by arranging batteries in parallel with each other via a cooling passage for passing cooling air therebetween, and provided with cooling air feeding means for feeding cooling air toward the cooling passage of the battery pack. Is known (for example, refer to Patent Document 1).
[0003]
In a fuel cell power plant, a composite panel in which a ceiling plate or a side wall plate covering the outer surface of the frame is provided with a sound absorbing material on the inner surface of a panel made of a metal plate in order to suppress the noise of the motor from leaking to the outside. Is known (for example, see Patent Document 2).
[0004]
Therefore, in the above-described battery pack cooling device, in order to prevent noise from the cooling wind duct that supplies or discharges the cooling wind to the cooling passage of the battery pack, sound is absorbed by the inner surface of the metal or synthetic resin cooling wind duct. It is considered to attach wood.
[0005]
Explaining a specific configuration example with reference to FIG. 4, reference numeral 31 denotes an exhaust duct connected to a discharge port of a cross-flow type exhaust fan disposed in a collective exhaust space above the battery pack, and has an inlet side. Has a flat rectangular shape, and is formed so as to narrow the flow path while bending to one side toward the outlet side, thereby forming a circular flow path cross section. Reference numeral 32 denotes a reinforcing column provided at appropriate intervals so as to connect the upper and lower wall surfaces in order to secure the strength of the rectangular cross section on the entrance side. In the exhaust duct 31 having such a shape, a vortex is generated on the inner peripheral side of the bent portion of the flow passage or the conversion portion of the cross-sectional shape of the flow passage, and high-frequency noise is generated due to a sudden change in the flow velocity due to the narrowing of the flow passage cross-section. Will do. Therefore, a sound absorbing material 33 made of a foamed synthetic resin is attached to almost the entire inner surface of the exhaust duct 31.
[0006]
[Patent Document 1]
JP 2001-167803 A
[Patent Document 2]
JP-A-10-289725
[Problems to be solved by the invention]
By the way, when the exhaust duct 31 having the configuration as shown in FIG. 4 is used, since the thick sound absorbing material 33 is adhered to the inner surface thereof, the flow passage cross-sectional area of the exhaust duct 31 decreases, and the pressure loss increases. As a result, there is a problem that the flow rate of the cooling air decreases, the cooling capacity decreases, the battery temperature increases, and the battery life decreases. Also, if the sound absorbing material 33 is peeled off, the flow path of the exhaust duct 31 will be clogged, causing a failure or breakage of the cooling device, making it impossible to use the assembled battery. There is a problem.
[0009]
The present invention has been made in view of the above-described conventional problems, and has as its object to provide a cooling device for an assembled battery that can effectively suppress noise without lowering cooling performance and without fear of failure or damage.
[0010]
[Means for Solving the Problems]
The cooling device for a battery pack of the present invention includes cooling air supply means for supplying cooling air to each cooling passage of the battery pack in which a plurality of secondary batteries are arranged in parallel with a cooling passage therebetween. In the cooling device of the assembled battery, an opening is formed in at least one wall surface of a cooling air duct, an inflow-side distribution space, and an outflow-side collective space, which supplies or discharges cooling air to or from a cooling passage, and the opening thereof A sound absorbing material is attached to the outer surface of the wall so as to cover the wall, and the generated sound wave energy is absorbed by the sound absorbing material through the opening, so that the noise can be effectively suppressed, and the sound absorbing material is applied to the outer surface of the wall. Since the material is attached, the flow path cross-sectional area can be made large, the pressure loss due to the attachment of the sound absorbing material can be eliminated, the flow rate of the cooling air can be secured, and the high cooling capacity can be maintained and the battery life can be improved. Also, even if the sound absorbing material is peeled off, it will not block the flow path, there is no risk of failure or damage to the cooling device, and it is only necessary to stick the sound absorbing material on the outer surface of the wall, Cost can be reduced.
[0011]
In addition, if the opening is formed on the inner peripheral side of the curved flow passage portion of the cooling air duct, vortex is generated on the inner peripheral side of the curved flow passage portion and noise is easily generated, but the sound wave energy is transmitted to the sound absorbing material through the opening. The sound absorption effect is effectively exhibited by being effectively absorbed.
[0012]
Also, if the opening is formed in the narrow passage of the cooling air duct, noise is likely to be generated due to the rapid increase of the flow velocity of the cooling air in the narrow passage, but the sound wave energy is effective by the sound absorbing material through the opening. The sound absorption effect is effectively exhibited by being absorbed in a specific way.
[0013]
In addition, when the openings are formed of a group of openings formed in a mesh in a predetermined area, the sound wave energy of noise can be effectively absorbed from the group of openings to the sound absorbing material while securing the strength of the cooling air duct and the bonding strength of the sound absorbing material. Can be.
[0014]
In addition, when the sound absorbing material is made of a foamed synthetic resin having open cells, the sound absorbing material can be made of a foamed synthetic resin at a low cost and light weight, and the energy can be effectively absorbed while the sound wave propagates through the open cells. , A high soundproof effect can be obtained.
[0015]
Also, if a branch opening is formed in the vicinity of a portion where the cross-sectional area of the flow passage of the exhaust duct for discharging the cooling air from the cooling passage is narrowed, the cooling air is diverted in the vicinity of the narrowed portion of the cross-sectional flow passage to cut the cross-sectional flow passage. It is possible to prevent the flow velocity of the cooling air from rapidly increasing in the constricted portion, and it is possible to suppress the generation of noise.
[0016]
Also, when the branch opening is connected to a passage for supplying cooling air toward the cooling passage, the cooling air is sucked and diverted, so that noise generation can be effectively suppressed, and the cooling air is discharged to the exhaust duct. Is not discharged to the surrounding environment other than the outlet of the fuel cell, it is possible to eliminate a possibility that hydrogen gas and the like discharged from the secondary battery and mixed in the cooling air may accumulate in the surrounding environment. Since the cooling air to be recirculated is a cooling air having a high temperature after cooling the battery pack, the flow rate of the cooling air to be recirculated needs to be set so as not to adversely affect the cooling performance of the battery pack.
[0017]
Further, in a battery pack cooling device provided with cooling air supply means for supplying cooling air to each cooling passage of a battery pack in which a plurality of secondary batteries are arranged in parallel with a cooling passage between each other, The exhaust duct that discharges cooling air from the cooling passage branches off near one or more of a portion where the cross-sectional area of the passage is narrowed, a bent passage portion, a mesh portion for preventing foreign matter from entering, and a louver portion. When the opening is formed, the effect of suppressing the noise by diverting the cooling air can be exerted in the narrowed portion of the cross-sectional area of the flow path of the exhaust duct, the mesh portion for preventing foreign matter from entering, and the louver portion. When connected to a passage that supplies cooling air toward the cooling passage, the cooling air is sucked and diverted, so that the generation of noise can be effectively suppressed, and the cooling air is discharged from the secondary battery and Water mixed in Such as gas can be prevented from accumulating in the surrounding environment.
[0018]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, an embodiment of a cooling device for a battery pack according to the present invention will be described with reference to FIGS.
[0019]
Reference numeral 1 denotes an assembled battery as a drive power source for an electric vehicle including a hybrid vehicle, in which 10 to 30 flat rectangular secondary batteries 2 are arranged in parallel with a cooling passage 3 provided between the long side surfaces thereof. It is configured to be sandwiched between a pair of end plates 4 disposed at both ends in the direction and integrally fixed by a restraining member (not shown). Each secondary battery 2 is configured as a battery module in which a plurality of cells are arranged in parallel in the longitudinal direction of the long side surface and the cells are connected in series inside each other. A predetermined output voltage is obtained by sequentially connecting the connection terminals 2a in series with a bus bar (not shown).
[0020]
In the battery pack 1, both ends of each secondary battery 2 in the longitudinal direction are supported by a support frame 5, and a lower case 6 is disposed below the support frames 5, 5. An inflow-side distribution space 7 is formed adjacent to the lower surface of each cooling passage 3 for uniformly distributing and supplying cooling air to each cooling passage 3. The upper part between the support frames 5, 5 is covered with the assembled battery 1 by the upper case 8, and the upper case 8 collects the cooling air flowing out of each cooling passage 3 adjacent to the upper surface of the assembled battery 1. An outlet-side collective space 9 is formed to protrude, and a discharge opening 9a is formed on the upper surface thereof.
[0021]
On the upper case 8, a cross-flow type fan 10 is disposed with its axis aligned along the parallel direction of the secondary batteries 2 of the assembled battery 1, and its suction port 10 a is joined to the discharge opening 9 a of the upper case 8. Have been. The fan 10 has a substantially cylindrical impeller 12 rotatably arranged in a fan case 11 and is configured to be rotatable by a motor 13 connected to one end in the axial direction. A stabilizer 14 is provided on one side of the outer periphery of the impeller 12. An exhaust path wall / suction chamber wall 17 extends obliquely downward from the tip of the stabilizer 14, and the tip is joined to the peripheral edge of the discharge opening 9 a of the upper case 8. A lower intake chamber 15 and an upper exhaust path 16 are defined by the exhaust path wall / suction chamber wall 17. The suction port 10 a of the fan 10 is configured by an opening on the lower surface of the suction chamber 15, and the discharge port 10 b of the fan 10 is configured by an opening on one side of the exhaust path 16.
[0022]
Reference numeral 18 denotes an exhaust duct, one end of which is connected to the discharge port 10b of the fan 10, and the other end of which is open to the outside of the vehicle. Further, one end of the inflow side distribution space 7 is connected to one end of an intake duct 19, and the other end of the intake duct 19 is configured to take in, for example, air in a vehicle compartment.
[0023]
The exhaust duct 18 includes an inlet duct portion 20 having a substantially rectangular cross section connected to the outlet 10 b of the fan 10, and a rectangular or cylindrical intermediate duct portion bent and extended from one side thereof. 21 and an outlet duct portion 22 which is bent and extended in a crank shape via an intermediate duct portion 21, and a bent channel portion 23 is provided between the inlet duct portion 20 and the intermediate duct portion 21. A flow path narrowing section 25 for narrowing a flow path cross-sectional area is formed in front of the bent flow path section 24 between the section 21 and the outlet duct section 22.
[0024]
A mesh-shaped opening group 26 is formed on the inner peripheral side of the curved flow path portion 23, the entire outer periphery of the flow path narrowing section 25, and the inner peripheral side of the curved flow path section 24, and the opening group 26 is formed on the outer surface thereof. A sound absorbing material 27 is stuck so as to cover the opening of. The sound absorbing material 27 is made of a foamed synthetic resin having open cells and an outer skin formed on the outer surface.
[0025]
According to the above configuration, the cooling air is sucked and fed by the fan 10 through the intake duct 19 and passes through the cooling passage 3 of the battery pack 1 to cool each secondary battery 2, and then the cooling air is discharged to the exhaust duct 18. When passing through the flow path, a vortex is generated in the bent flow path part 23 or the flow velocity is rapidly increased in the flow path constriction part 25 to generate high-frequency noise. Since the noise is absorbed by the material 27, noise emitted to the outside from the exhaust duct 18 can be effectively suppressed. In addition, since the sound absorbing material 27 is attached to the outer surface of the exhaust duct 18, the flow passage cross-sectional area of the exhaust duct 18 can be made larger than in the conventional case where the sound absorbing material 27 is attached to the inner surface. The flow rate of the cooling air can be ensured without pressure loss, and the battery life can be improved by maintaining a high cooling capacity.
[0026]
Further, even if the sound absorbing material 27 is peeled off, the flow path will not be blocked, so that there is no risk of failure or damage of the cooling device, and only the sound absorbing material is stuck on the outer surface of the exhaust duct 18. Therefore, the manufacturing cost can be reduced.
[0027]
Further, since the openings for allowing the sound absorbing material 27 to face the flow path are formed by the mesh-like opening group 26, the strength of the exhaust duct 18 and the sound absorbing material are larger than when a single or a small number of openings are formed. 27 can be secured, and the sound wave energy of noise can be effectively absorbed by the sound absorbing material 27 from the group of openings 26, so that a high noise suppression effect can be obtained.
[0028]
In addition, since the sound absorbing material 27 is made of a foamed synthetic resin having open cells, it can be made lightweight and inexpensive with the foamed synthetic resin, and effectively absorbs its energy while sound waves propagate in the open cells. And a high soundproofing effect can be obtained. In addition, if a sound absorbing material 27 having an outer surface with an outer skin is used, sound waves not absorbed by the outer skin can be prevented from propagating to the outside, so that a higher soundproofing effect can be obtained.
[0029]
In the description of the above-described embodiment, the opening group 26 is formed and the sound absorbing material 27 is attached to the outer surface thereof to prevent sound. However, as shown by phantom lines in FIGS. A branch opening 28 is formed in the vicinity of the passage narrowing portion 25, and the branch opening 28 and the intake duct 19 are connected by a branch passage 29, and a part of the cooling air passing through the passage narrowing portion 25 is returned to the intake side. You may make it do.
[0030]
According to this configuration, by dividing the cooling air from the branch opening 28 in the vicinity of the flow path constriction 25, the flow velocity of the cooling air in the flow path constriction 25 is prevented from rapidly increasing, and noise is generated. Can be suppressed. Further, by connecting the branch opening 28 to the intake duct 19 through the branch passage 29 to suck and divide the cooling air, the generation of noise can be effectively suppressed. Since the cooling air to be recirculated in the branch passage 29 is a high-temperature cooling air after cooling the battery pack 1, the flow rate thereof needs to be set so as not to adversely affect the cooling performance of the battery pack 1. .
[0031]
Although noise can be prevented by providing the branch opening 28 and the branch passage 29 alone, it is preferable that the branch opening 28 and the branch passage 29 be used in combination with the opening group 26 and the sound absorbing material 27 as in the present embodiment.
[0032]
Further, as shown in FIG. 1, a branch opening 28 a is separately provided in a portion where the cross-sectional area of the flow passage on the way to the outlet of the exhaust duct 18 is narrowed or in a bent flow passage portion. A branch opening 28b may be provided in the vicinity of a mesh portion (not shown) for preventing entry of foreign matter such as rainwater, and by doing so, noise can be suppressed by diverting the cooling air as described above. Further, when these branch openings 28a and 28b are also connected to the intake duct 19, the cooling air is sucked and diverted, so that noise can be effectively suppressed only by forming a small branch opening.
[0033]
Further, in the above embodiment, the example in which the fan 10 is provided on the exhaust side and the cooling air is sucked and circulated through the cooling passage 3 of the battery pack 1 has been described. May be provided to supply cooling air to the cooling passage 3 of the battery pack 1 under pressure to distribute the cooling air. In any case, the present invention is not limited to the exhaust duct 18 side shown in the above embodiment, but also the feed duct side, both the exhaust duct and the feed duct, the inlet distribution space 7 and the outlet collective space 9. In the above, an opening can be provided in the bent channel portion or the narrowed channel portion, and a sound absorbing material can be attached to an outer surface of the channel portion, whereby an effect of suppressing noise can be obtained.
[0034]
【The invention's effect】
ADVANTAGE OF THE INVENTION According to the cooling device of the assembled battery of this invention, an opening is formed in at least one wall surface among the cooling air duct, the inflow side distribution space, and the outflow side assembly space which supplies or discharges the cooling air to the cooling passage. Since the sound absorbing material is attached to the outer surface of the wall so as to cover the opening, the generated sound wave energy is absorbed by the sound absorbing material through the opening, so that noise can be effectively suppressed, and the outer surface of the wall can be effectively prevented. The sound-absorbing material is attached to the filter so that the cross-sectional area of the flow path can be large, the pressure loss due to the application of the sound-absorbing material can be eliminated, the flow rate of cooling air can be secured, the high cooling capacity can be maintained, and the battery life can be improved. Even if the sound absorbing material comes off, it does not block the flow path, there is no risk of failure or damage to the cooling device, and it is only necessary to attach the sound absorbing material to the outer surface of the wall, so reduce costs Effects such as It is.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional front view of an embodiment of a battery pack cooling device of the present invention.
FIG. 2 is a sectional view taken along the line AA of FIG. 1;
FIG. 3 is an exploded perspective view of a main part configuration in the embodiment.
4A and 4B show an exhaust duct of a main part configuration of a cooling device for a battery pack of a conventional example, wherein FIG. 4A is a perspective view, FIG. 4B is a cross-sectional view of FIG. It is sectional drawing in the CC arrow of a).
[Explanation of symbols]
REFERENCE SIGNS LIST 1 battery pack 2 rechargeable battery 3 cooling passage 18 exhaust duct 23 bent passage portion 25 passage narrowing portion 26 opening group 27 sound absorbing materials 28, 28 a, 28 b branch opening 29 branch passage

Claims (9)

複数の二次電池を各々の間に冷却通路をあけて並列配置して成る組電池の各冷却通路に冷却風を送給する冷却風送給手段を備えた組電池の冷却装置において、冷却通路に対して冷却風を送給又は排出する、冷却風ダクト、流入側分配空間及び流出側集合空間のうちの少なくとも一つの壁面に開口を形成し、その開口を覆うように前記壁面の外面に吸音材を貼付けたことを特徴とする組電池の冷却装置。A cooling apparatus for a battery pack, comprising: cooling air supply means for supplying cooling air to each cooling passage of a battery pack comprising a plurality of secondary batteries arranged in parallel with a cooling passage therebetween. An opening is formed in at least one wall surface of a cooling air duct, an inflow-side distribution space, and an outflow-side collective space for supplying or discharging cooling air to and from the outer surface of the wall surface so as to cover the opening. A cooling device for an assembled battery, wherein a material is attached. 開口は、冷却風ダクトの屈曲流路部の内周側に形成したことを特徴とする請求項１記載の組電池の冷却装置。2. The cooling device for an assembled battery according to claim 1, wherein the opening is formed on an inner peripheral side of the curved flow passage portion of the cooling air duct. 開口は、冷却風ダクトの流路狭窄部に形成したことを特徴とする請求項１記載の組電池の冷却装置。2. The cooling device for an assembled battery according to claim 1, wherein the opening is formed in a narrow portion of the flow passage of the cooling air duct. 開口は、所定領域に網目状に形成した開口群から成ることを特徴とする請求項１〜３の何れかに記載の組電池の冷却装置。The cooling device for a battery pack according to any one of claims 1 to 3, wherein the opening comprises a group of openings formed in a mesh in a predetermined area. 吸音材は、連続気泡を有する発泡合成樹脂から成ることを特徴とする請求項１〜４の何れかに記載の組電池の冷却装置。The cooling device for an assembled battery according to any one of claims 1 to 4, wherein the sound absorbing material is made of a foamed synthetic resin having open cells. 冷却通路からの冷却風を排出する排気ダクトの流路断面積が狭窄する部分の近傍に分岐開口を形成したことを特徴とする請求項１〜５の何れかに記載の組電池の冷却装置。The cooling device for an assembled battery according to any one of claims 1 to 5, wherein a branch opening is formed near a portion where the cross-sectional area of the flow path of the exhaust duct that discharges cooling air from the cooling passage is narrowed. 分岐開口を冷却通路に向けて冷却風を送給する通路に接続したことを特徴とする請求項６記載の組電池の冷却装置。7. The cooling device for an assembled battery according to claim 6, wherein the branch opening is connected to a passage for supplying cooling air toward the cooling passage. 複数の二次電池を各々の間に冷却通路をあけて並列配置して成る組電池の各冷却通路に冷却風を送給する冷却風送給手段を備えた組電池の冷却装置において、冷却通路からの冷却風を排出する排気ダクトの流路断面積が狭窄する部分、屈曲流路部分、異物混入防止用メッシュ部分及びルーバー部分のうちの何れかの１又は複数の部分の近傍に分岐開口を形成したことを特徴とする組電池の冷却装置。A cooling apparatus for a battery pack, comprising: cooling air supply means for supplying cooling air to each cooling passage of a battery pack comprising a plurality of secondary batteries arranged in parallel with a cooling passage therebetween. A branch opening is formed in the vicinity of any one or more of the section where the cross-sectional area of the flow path of the exhaust duct for discharging the cooling air from the air passage is narrowed, the bent flow path section, the mesh section for preventing foreign matter entry, and the louver section. A cooling device for an assembled battery, wherein the cooling device is formed. 分岐開口を冷却通路に向けて冷却風を送給する通路に接続したことを特徴とする請求項８記載の組電池の冷却装置。9. The cooling device for an assembled battery according to claim 8, wherein the branch opening is connected to a passage for supplying cooling air toward the cooling passage.
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WO2011142304A1 (en) * 2010-05-11 2011-11-17 スズキ株式会社 Device for cooling vehicle battery
JP2012182144A (en) * 2006-10-06 2012-09-20 Primearth Ev Energy Co Ltd Battery pack
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WO2007043692A1 (en) 2005-10-13 2007-04-19 Toyota Jidosha Kabushiki Kaisha Structure for installing electric component
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