JP7099335B2 - Battery pack - Google Patents

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JP7099335B2
JP7099335B2 JP2019002540A JP2019002540A JP7099335B2 JP 7099335 B2 JP7099335 B2 JP 7099335B2 JP 2019002540 A JP2019002540 A JP 2019002540A JP 2019002540 A JP2019002540 A JP 2019002540A JP 7099335 B2 JP7099335 B2 JP 7099335B2
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air supply
case
duct
exhaust duct
internal pressure
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JP2020113422A (en
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悠史 近藤
信司 鈴木
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Toyota Industries Corp
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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
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Description

本発明は、圧力開放弁を有する複数の二次電池を収容するケースを有する電池パックに関する。 The present invention relates to a battery pack having a case for accommodating a plurality of secondary batteries having a pressure release valve.

ＥＶ（Electric Vehicle）やＰＨＶ（Plug in Hybrid Vehicle）などの車両には、原動機となる電動機への供給電力を蓄える蓄電装置としてリチウムイオン電池などの二次電池が複数搭載されている。複数の二次電池は、直列接続又は並列接続された電池モジュールとして電池パックのケースに収容されている。また、二次電池の電池ケースには、正極及び負極の積層体である電極組立体、及び電解液が収容されている。二次電池の電池ケースにおける壁部には、電池ケース内の圧力を電池ケース外に開放させる圧力開放弁が設けられている。 Vehicles such as EVs (Electric Vehicles) and PHVs (Plugs in Hybrid Vehicles) are equipped with a plurality of secondary batteries such as lithium-ion batteries as storage devices for storing the power supplied to the motor as the prime mover. A plurality of secondary batteries are housed in a battery pack case as battery modules connected in series or in parallel. Further, the battery case of the secondary battery contains an electrode assembly which is a laminated body of a positive electrode and a negative electrode, and an electrolytic solution. A pressure release valve is provided on the wall of the battery case of the secondary battery to release the pressure inside the battery case to the outside of the battery case.

二次電池では、正極と負極との内部短絡や、過充放電などによって、電極組立体の一部が発熱し、この電極組立体の発熱反応が制御不能に繰り返される状態、所謂熱暴走に陥ることがある。二次電池が熱暴走した状態では、二次電池の温度は自発的に上昇し続ける。すると、電解液が分解され、電池ケース内にガスが発生し、電池ケースの内圧が上昇する。そして、電池ケースの内圧が既定値を超えると、圧力開放弁が破断して、電池ケースの内圧が開放されるとともに、電池ケース内からガスが噴出する。ガスの噴出により、電池パックのケースの内圧が上昇するが、ケースの内圧上昇に伴う破損を抑制するため、例えば、特許文献１では、電池パックのケースに、ガスを排出するための機構を設けている。 In a secondary battery, a part of the electrode assembly generates heat due to an internal short circuit between the positive electrode and the negative electrode, overcharging and discharging, and the exothermic reaction of the electrode assembly is repeated uncontrollably, resulting in so-called thermal runaway. Sometimes. When the secondary battery is in a state of thermal runaway, the temperature of the secondary battery continues to rise spontaneously. Then, the electrolytic solution is decomposed, gas is generated in the battery case, and the internal pressure of the battery case rises. When the internal pressure of the battery case exceeds a predetermined value, the pressure release valve is broken, the internal pressure of the battery case is released, and gas is ejected from the inside of the battery case. The internal pressure of the battery pack case rises due to the ejection of gas, but in order to suppress damage due to the rise in the internal pressure of the case, for example, in Patent Document 1, the battery pack case is provided with a mechanism for discharging gas. ing.

特許文献１の組電池は、複数の二次電池から構成される電池群を収容したケースを備える。ケースは、電池群の周囲に冷却空気を流す冷却流路と、冷却流路から区画され、二次電池から放出されたガスを排気するガス排気流路と、冷却流路とガス排気流路とを連通する短絡流路と、を有する。また、組電池は、冷却流路の給気口及び排気口それぞれに設けられた開閉弁を有するとともに、短絡流路にリリーフ弁を有する。 The assembled battery of Patent Document 1 includes a case containing a battery group composed of a plurality of secondary batteries. The case includes a cooling flow path that allows cooling air to flow around the battery group, a gas exhaust flow path that is partitioned from the cooling flow path and exhausts gas discharged from the secondary battery, and a cooling flow path and a gas exhaust flow path. It has a short-circuit flow path that communicates with the gas. Further, the assembled battery has an on-off valve provided in each of the air supply port and the exhaust port of the cooling flow path, and also has a relief valve in the short-circuit flow path.

そして、二次電池からガスが放出された場合、開閉弁が閉じられ、冷却流路が閉じられる。さらに、冷却流路の内圧が所定値以上に上昇すると、リリーフ弁が開放される。これにより、冷却流路は短絡流路を介してガス排気流路に連通し、冷却流路内の気体がガス排気流路を通して室外又は車外に排気される。その結果、ケースの内圧上昇が抑制され、ケースの破損が抑制される。 Then, when the gas is discharged from the secondary battery, the on-off valve is closed and the cooling flow path is closed. Further, when the internal pressure of the cooling flow path rises above a predetermined value, the relief valve is opened. As a result, the cooling flow path communicates with the gas exhaust flow path via the short-circuit flow path, and the gas in the cooling flow path is exhausted to the outside or the outside of the vehicle through the gas exhaust flow path. As a result, the increase in the internal pressure of the case is suppressed, and the damage of the case is suppressed.

特開２０１０－１９２２０９号公報Japanese Unexamined Patent Publication No. 2010-192209

ところが、電池パックのケース内において、二次電池の電池ケースから噴出したガスに引火することがある。このとき、ケース内は酸素欠乏状態となり、類焼が阻止されるが、ケース内が酸素欠乏状態となるため、ケース内には有害ガスである一酸化炭素が発生することがある。しかし、特許文献１に開示のガス排出機構においては、ケースの破損を抑制するため、ケース内のガスをそのままケースから室外又は車外に排出しており、上記のように一酸化炭素が発生した場合は、一酸化炭素がそのまま室外又は車外に排出されることとなり、環境的に好ましくない。 However, in the case of the battery pack, the gas ejected from the battery case of the secondary battery may ignite. At this time, the inside of the case becomes oxygen-deficient and burning is prevented, but since the inside of the case becomes oxygen-deficient, carbon monoxide, which is a harmful gas, may be generated in the case. However, in the gas discharge mechanism disclosed in Patent Document 1, in order to prevent damage to the case, the gas inside the case is discharged as it is from the case to the outside or the outside of the vehicle, and carbon monoxide is generated as described above. Is environmentally unfavorable because carbon monoxide is discharged to the outside of the room or the vehicle as it is.

本発明の目的は、二次電池の異常時にケース内に発生した一酸化炭素がケース外へ放出されることを抑制できる電池パックを提供することにある。 An object of the present invention is to provide a battery pack capable of suppressing the release of carbon monoxide generated in the case to the outside of the case when the secondary battery is abnormal.

上記問題点を解決するための電池パックは、電池ケース内に電解液及び電極組立体が収容され、前記電池ケースの内圧が規定圧力を超えた場合に前記電池ケースの内圧を開放する圧力開放弁を有する複数の二次電池と、複数の前記二次電池を収容する密閉状のケースと、前記ケース内に発生した一酸化炭素を当該ケースの外へ排出するために前記ケースに設けられた排出口と、前記排出口に接続され、当該排出口から前記ケースの外へ排出された前記一酸化炭素が流れる排気ダクトと、前記排気ダクトに空気を流入させるために当該排気ダクトに設けられた給気口と、前記排気ダクトの内圧が負圧となったときに前記給気口から前記排気ダクトへの空気の流入を許容する一方で、前記排気ダクトを流れる前記一酸化炭素が前記給気口から排出されることを抑止する逆止弁と、を有し、前記圧力開放弁によって前記電池ケースの内圧が開放されたときの前記ケースの内圧に対し前記排気ダクトの内圧が負圧になるように設定されていることを要旨とする。 A battery pack for solving the above problems is a pressure release valve in which an electrolytic solution and an electrode assembly are housed in a battery case, and the internal pressure of the battery case is released when the internal pressure of the battery case exceeds a specified pressure. A plurality of secondary batteries, a sealed case accommodating the plurality of the secondary batteries, and a discharge provided in the case for discharging carbon monoxide generated in the case to the outside of the case. An outlet, an exhaust duct connected to the discharge port and through which the carbon monoxide discharged from the discharge port to the outside of the case flows, and a supply provided in the exhaust duct for allowing air to flow into the exhaust duct. When the internal pressure of the air port and the exhaust duct becomes negative, the air supply port allows the inflow of air from the air supply port to the exhaust duct, while the carbon monoxide flowing through the exhaust duct is the air supply port. It has a check valve that suppresses discharge from the battery case, so that the internal pressure of the exhaust duct becomes negative with respect to the internal pressure of the case when the internal pressure of the battery case is released by the pressure release valve. The gist is that it is set to.

これによれば、電池パックのケース内において、いずれかの二次電池に熱暴走が発生し、圧力開放弁によって二次電池の内圧が開放されると、二次電池の電池ケースからガスが電池ケース外に噴出し、噴出したガスに引火することがある。このとき、密閉状のケース内は酸素欠乏状態となり、類焼が阻止されるが、ケース内が酸素欠乏状態となるため、ケース内には有害ガスである一酸化炭素が発生する。 According to this, when a thermal runaway occurs in one of the secondary batteries in the case of the battery pack and the internal pressure of the secondary battery is released by the pressure release valve, gas is released from the battery case of the secondary battery. It may spurt out of the case and ignite the spouted gas. At this time, the inside of the sealed case becomes oxygen-deficient and burning is prevented, but since the inside of the case becomes oxygen-deficient, carbon monoxide, which is a harmful gas, is generated in the case.

ケースの内圧に対し排気ダクトの内圧が負圧になると、ケース内の一酸化炭素は排気ダクトに流れ込む。排気ダクト内が負圧になると、逆止弁が開き、給気口から排気ダクト内に空気が供給される。すると、排気ダクトを流れる一酸化炭素に空気が混合され、二酸化炭素が発生する。その結果、二次電池の異常時にケース内に発生した一酸化炭素がケース外へ放出されることを抑制できる。 When the internal pressure of the exhaust duct becomes negative with respect to the internal pressure of the case, carbon monoxide in the case flows into the exhaust duct. When the pressure inside the exhaust duct becomes negative, the check valve opens and air is supplied into the exhaust duct from the air supply port. Then, air is mixed with carbon monoxide flowing through the exhaust duct, and carbon dioxide is generated. As a result, it is possible to suppress the release of carbon monoxide generated in the case to the outside of the case when the secondary battery is abnormal.

また、電池パックについて、前記排出口を開閉する開閉部を備え、前記排気ダクトは、前記開閉部を介して前記排出口に接続されていてもよい。
これによれば、開閉部が閉じた状態にあるときに二次電池からガスが噴出すると、ケースの内圧は上昇する一方で排気ダクトの内圧は大気圧のままである。このため、ケースの内圧に対し、排気ダクトの内圧が負圧になるまで開閉弁を閉じた状態に維持することにより、ケースの内圧と排気ダクトの内圧に差圧を生じさせやすくなる。そして、開閉部が開いたときには、ケースから排気ダクトに一酸化炭素を流しやすくなる。 Further, the battery pack may be provided with an opening / closing portion for opening / closing the discharge port, and the exhaust duct may be connected to the discharge port via the opening / closing portion.
According to this, when gas is ejected from the secondary battery while the opening / closing portion is closed, the internal pressure of the case rises while the internal pressure of the exhaust duct remains at atmospheric pressure. Therefore, by keeping the on-off valve closed until the internal pressure of the exhaust duct becomes negative with respect to the internal pressure of the case, it becomes easy to generate a differential pressure between the internal pressure of the case and the internal pressure of the exhaust duct. Then, when the opening / closing portion is opened, carbon monoxide can easily flow from the case to the exhaust duct.

また、電池パックについて、前記電池パックは、車両に搭載されるとともに前記給気口に接続される給気ダクトを備え、前記給気ダクトの入口は、前記車両の前方に向けて開口していてもよい。 Further, regarding the battery pack, the battery pack is mounted on the vehicle and includes an air supply duct connected to the air supply port, and the entrance of the air supply duct is open toward the front of the vehicle. May be good.

これによれば、車両の走行中には、給気ダクトの入口に空気が自然に流入してくる。このため、給気ダクトから給気口を介して排気ダクト内に効率良く空気を供給できる。
また、電池パックについて、前記電池パックは、車両に搭載されるとともに前記給気口に接続される給気ダクトを備え、前記ケースから排出された前記一酸化炭素が前記排気ダクトを流れる方向を排気方向とし、前記給気ダクトにおいて前記給気口に向けて空気の流れる方向を給気方向とすると、前記給気ダクトは、前記給気方向が前記排気方向に沿うように前記給気口に接続されていてもよい。 According to this, air naturally flows into the inlet of the air supply duct while the vehicle is running. Therefore, air can be efficiently supplied from the air supply duct to the exhaust duct through the air supply port.
Further, regarding the battery pack, the battery pack is mounted on a vehicle and includes an air supply duct connected to the air supply port, and the carbon monoxide discharged from the case is exhausted in the direction of flowing through the exhaust duct. Assuming that the air supply direction is the direction in which air flows toward the air supply port in the air supply duct, the air supply duct is connected to the air supply port so that the air supply direction is along the exhaust direction. It may have been done.

これによれば、逆止弁が開弁し、給気ダクトから給気口に向けて空気が流れたとき、給気ダクトから給気口に流れ込む空気は、排気ダクトにおける排気方向に沿うようになり、排気ダクトを流れる一酸化炭素に対し、給気ダクトから空気が供給しやすく、混ざりやすくなる。 According to this, when the check valve is opened and the air flows from the air supply duct toward the air supply port, the air flowing from the air supply duct to the air supply port is along the exhaust direction in the exhaust duct. Therefore, air is easily supplied from the air supply duct to the carbon monoxide flowing through the exhaust duct, and is easily mixed.

また、電池パックについて、前記電池パックは、車両に搭載されるとともに前記給気口に接続される給気ダクトを備え、前記給気ダクトの入口に向けて空気を送る給気ファンを備えていてもよい。 Further, regarding the battery pack, the battery pack is mounted on a vehicle and is provided with an air supply duct connected to the air supply port, and is provided with an air supply fan that sends air toward the inlet of the air supply duct. May be good.

これによれば、給気ファンから送られた空気が、給気ダクト内に強制的に供給される。このため、排気ダクトを流れる一酸化炭素に対し、給気ダクトから空気が供給しやすく、混ざりやすくなる。 According to this, the air sent from the air supply fan is forcibly supplied into the air supply duct. Therefore, air is easily supplied from the air supply duct to the carbon monoxide flowing through the exhaust duct, and is easily mixed.

本発明によれば、二次電池の異常時にケース内に発生した一酸化炭素がケース外へ放出されることを抑制できる。 According to the present invention, it is possible to suppress the release of carbon monoxide generated in the case to the outside of the case when the secondary battery is abnormal.

車両における車室空間及び電池パックの配置を模式的に示す図。The figure which shows typically the arrangement of the vehicle interior space and the battery pack in a vehicle. 実施形態の電池パックを模式的に示す部分縦断面図。A partial vertical sectional view schematically showing a battery pack of an embodiment. 実施形態の電池パックを模式的に示す平断面図。FIG. 5 is a plan sectional view schematically showing a battery pack of an embodiment. 二次電池を示す斜視図。The perspective view which shows the secondary battery. 排気ダクト、開閉部及び給気口付近を示す部分縦断面図。A partial vertical sectional view showing the vicinity of the exhaust duct, the opening / closing part, and the air supply port. 開閉部及び逆止弁が開弁したときの状態を示す部分縦断面図。A partial vertical sectional view showing a state when the opening / closing part and the check valve are opened. 別例の電池パックを車両に搭載した状態を示す模式図。The schematic diagram which shows the state which the battery pack of another example is mounted on a vehicle. 別例の電池パックを示す模式図。The schematic diagram which shows the battery pack of another example.

以下、電池パックを具体化した一実施形態を図１～図６にしたがって説明する。
図１に示すように、車両１０は、車室空間１０ａの中に座席１１を前後方向に２列に備える。なお、車両１０は、座席１１を前後方向に１列備えていてもよいし、前後方向に３列備えていてもよい。車両１０は、車室空間１０ａにおける後部の座席１１の下方に配置された電池パック１４を備える。 Hereinafter, an embodiment in which the battery pack is embodied will be described with reference to FIGS. 1 to 6.
As shown in FIG. 1, the vehicle 10 is provided with seats 11 in two rows in the front-rear direction in the vehicle interior space 10a. The vehicle 10 may be provided with one row of seats 11 in the front-rear direction, or may be provided with three rows in the front-rear direction. The vehicle 10 includes a battery pack 14 arranged below the rear seat 11 in the vehicle interior space 10a.

図２又は図３に示すように、電池パック１４は、四角箱状のケース１５と、ケース１５の内部に収容された複数の二次電池２０を有している。ケース１５は、矩形平板状の底板１６と、底板１６の短手方向に対向する一対の端縁から立設する第１側壁１７と、底板１６の長手方向に対向する一対の端縁から立設する第２側壁１８と、一対の第１側壁１７及び一対の第２側壁１８の上端に支持された天板１９と、を有する。収容空間Ｓは、底板１６と、一対の第１側壁１７と、一対の第２側壁１８と、天板１９とによって区画されている。 As shown in FIG. 2 or 3, the battery pack 14 has a square box-shaped case 15 and a plurality of secondary batteries 20 housed inside the case 15. The case 15 is erected from a rectangular flat plate-shaped bottom plate 16, a first side wall 17 erected from a pair of edge facing the bottom plate 16 in the lateral direction, and a pair of edge facing the bottom plate 16 in the longitudinal direction. The second side wall 18 is provided with a pair of first side walls 17 and a top plate 19 supported by the upper ends of the pair of second side walls 18. The accommodation space S is partitioned by a bottom plate 16, a pair of first side walls 17, a pair of second side walls 18, and a top plate 19.

ケース１５は、収容空間Ｓを気密に略密閉し、後述する排出口２６以外の箇所での気体の出入りが抑止された構造を有する。そして、気密に略密閉された収容空間Ｓに複数の二次電池２０が収容されている。ここで「略密閉」とは、ケース１５内が酸素欠乏状態となり、二次電池２０の類焼が阻止される状態を意味する。 The case 15 has a structure in which the accommodation space S is airtightly and substantially sealed, and the inflow and outflow of gas is suppressed at a place other than the discharge port 26 described later. A plurality of secondary batteries 20 are housed in the airtightly sealed storage space S. Here, "substantially sealed" means a state in which the inside of the case 15 becomes oxygen-deficient and the burning of the secondary battery 20 is prevented.

なお、二次電池２０はリチウムイオン二次電池である。図４に示すように、二次電池２０は、電池ケース２１を備える。二次電池２０の電池ケース２１は、扁平な四角箱状である。複数の二次電池２０は、底板１６の長手方向に電池ケース２１の厚さ方向が沿うように並べられている。よって、ケース１５の長手方向と二次電池２０の並設方向とが一致する。なお、複数の二次電池２０は並列接続されていてもよいし、直列接続されていてもよい。 The secondary battery 20 is a lithium ion secondary battery. As shown in FIG. 4, the secondary battery 20 includes a battery case 21. The battery case 21 of the secondary battery 20 has a flat square box shape. The plurality of secondary batteries 20 are arranged so that the thickness direction of the battery case 21 is aligned with the longitudinal direction of the bottom plate 16. Therefore, the longitudinal direction of the case 15 and the parallel direction of the secondary batteries 20 coincide with each other. The plurality of secondary batteries 20 may be connected in parallel or may be connected in series.

電池ケース２１には電極組立体２１ａ及び図示しない電解液が収容されている。電極組立体２１ａは正極と負極を備えている。電池ケース２１は、電極組立体２１ａを収容する有底箱状のケース本体２２と、ケース本体２２の開口部を閉塞する板状の蓋部２３とから構成されている。蓋部２３には、接続端子２４が設けられている。接続端子２４は、図示しない導電部材を介して電極組立体２１ａに電気的に接続されている。 The battery case 21 contains the electrode assembly 21a and an electrolytic solution (not shown). The electrode assembly 21a includes a positive electrode and a negative electrode. The battery case 21 is composed of a bottomed box-shaped case body 22 for accommodating the electrode assembly 21a and a plate-shaped lid portion 23 for closing the opening of the case body 22. The lid portion 23 is provided with a connection terminal 24. The connection terminal 24 is electrically connected to the electrode assembly 21a via a conductive member (not shown).

二次電池２０では、正極と負極との内部短絡や、過充放電などによって、電極組立体２１ａの一部が発熱し、この電極組立体２１ａの発熱反応が制御不能に繰り返される状態、所謂、熱暴走に陥ることがある。二次電池２０が熱暴走した状態では、二次電池２０の温度は自発的に上昇し続ける。すると、電解液が分解され、電池ケース２１内にガスが発生し、電池ケース２１の内圧が上昇する。 In the secondary battery 20, a part of the electrode assembly 21a generates heat due to an internal short circuit between the positive electrode and the negative electrode, overcharging and discharging, and the exothermic reaction of the electrode assembly 21a is repeated uncontrollably, so-called. You may fall into a thermal runaway. When the secondary battery 20 is in a state of thermal runaway, the temperature of the secondary battery 20 continues to rise spontaneously. Then, the electrolytic solution is decomposed, gas is generated in the battery case 21, and the internal pressure of the battery case 21 rises.

蓋部２３には、電池ケース２１の内圧が規定圧力を超えるまで上昇したときに、破断して電池ケース２１の内圧を開放するための圧力開放弁２５が設けられている。なお、「規定圧力」は、電池ケース２１の内圧が高まったときに、電池ケース２１の内圧によって電池ケース２１が破損する前に圧力開放弁２５が破断するような圧力に設定される。そして、電池ケース２１の内圧が上昇し、圧力開放弁２５が破断すると、電池ケース２１内からガスが噴出する。 The lid portion 23 is provided with a pressure release valve 25 for breaking and releasing the internal pressure of the battery case 21 when the internal pressure of the battery case 21 rises to exceed a predetermined pressure. The "specified pressure" is set to a pressure at which the pressure release valve 25 breaks before the battery case 21 is damaged by the internal pressure of the battery case 21 when the internal pressure of the battery case 21 increases. Then, when the internal pressure of the battery case 21 rises and the pressure release valve 25 breaks, gas is ejected from the inside of the battery case 21.

図２又は図３に示すように、電池パック１４のケース１５は、上記したように気密な略密閉状である。このため、万一、電池ケース２１からガスが噴出し、ガスに引火したとしても、即座にケース１５内が酸素欠乏状態となり、類焼が阻止されるようになっている。しかし、ケース１５内には、有害ガスである一酸化炭素（ＣＯ）が発生する。 As shown in FIG. 2 or 3, the case 15 of the battery pack 14 is airtight and substantially sealed as described above. Therefore, even if the gas is ejected from the battery case 21 and the gas ignites, the inside of the case 15 immediately becomes oxygen-deficient and the burning is prevented. However, carbon monoxide (CO), which is a harmful gas, is generated in the case 15.

電池パック１４は、ケース１５内に発生した一酸化炭素をケース１５外へ排出するための構成を有する。以下、一酸化炭素をケース１５外へ排出する構成について説明する。
電池パック１４は、ケース１５の一対の第２側壁１８のうちの一方に、当該一方の第２側壁１８の一部が円形状に開口した排出口２６を備える。排出口２６は、ケース１５の内外を連通させる。排出口２６は、ケース１５内に発生した一酸化炭素をケース１５外へ排出するために設けられる。排出口２６は、並設された複数の二次電池２０のうち、並設方向の一端に配置された二次電池２０に対向する第２側壁１８に設けられている。排出口２６は、第２側壁１８の上端縁より僅かに下方で、かつ並設方向一端の二次電池２０の蓋部２３より上方に設けられている。また、排出口２６は、ケース１５の短手方向の中央に設けられている。複数の二次電池２０の圧力開放弁２５上を通過し、かつ並設方向に延びる仮想線をＭとすると、排出口２６は、排出口２６の中心軸と、この仮想線Ｍとが一致するように配置されている。 The battery pack 14 has a configuration for discharging carbon monoxide generated in the case 15 to the outside of the case 15. Hereinafter, a configuration for discharging carbon monoxide to the outside of the case 15 will be described.
The battery pack 14 includes a discharge port 26 in which a part of the second side wall 18 of the case 15 is opened in a circular shape on one of the pair of second side walls 18 of the case 15. The discharge port 26 communicates the inside and outside of the case 15. The discharge port 26 is provided to discharge the carbon monoxide generated in the case 15 to the outside of the case 15. The discharge port 26 is provided on the second side wall 18 facing the secondary battery 20 arranged at one end in the parallel arrangement direction among the plurality of juxtaposed secondary batteries 20. The discharge port 26 is provided slightly below the upper end edge of the second side wall 18 and above the lid portion 23 of the secondary battery 20 at one end in the parallel arrangement direction. Further, the discharge port 26 is provided in the center of the case 15 in the lateral direction. Assuming that M is a virtual line that passes over the pressure release valves 25 of the plurality of secondary batteries 20 and extends in the parallel direction, the central axis of the discharge port 26 coincides with the virtual line M. It is arranged like this.

電池パック１４は、一方の第２側壁１８から筒状に突出した接続部１８ａを備える。接続部１８ａは、一方の第２側壁１８に開口した排出口２６を囲むように形成されている。接続部１８ａは、接続部１８ａの中心軸と排出口２６の中心軸が一致するように配置されている。本実施形態では、排出口２６の口径と接続部１８ａの内径は一致している。なお、排出口２６の口径と接続部１８ａの内径は一致していなくてもよく、排出口２６の口径に対して接続部１８ａの内径が小さくてもよいし、大きくてもよい。 The battery pack 14 includes a connecting portion 18a that protrudes in a cylindrical shape from one of the second side walls 18. The connection portion 18a is formed so as to surround the discharge port 26 opened in one of the second side walls 18. The connecting portion 18a is arranged so that the central axis of the connecting portion 18a and the central axis of the discharge port 26 coincide with each other. In the present embodiment, the diameter of the discharge port 26 and the inner diameter of the connection portion 18a are the same. The diameter of the discharge port 26 and the inner diameter of the connection portion 18a may not match, and the inner diameter of the connection portion 18a may be smaller or larger than the diameter of the discharge port 26.

電池パック１４は、第２側壁１８の接続部１８ａを介して排出口２６に接続される排気ダクト２７を備える。排気ダクト２７は、金属製の細長筒状である。排気ダクト２７内の容積は、ケース１５内の容積より小さい。排気ダクト２７の軸線Ｌ１は、水平方向に延びる。排気ダクト２７の入口２７ａは、後述する開閉部２８を介して排出口２６に連通し、排気ダクト２７の出口２７ｂは、車室空間１０ａより外であり、車両１０の外に向けて開口するように配置されている。 The battery pack 14 includes an exhaust duct 27 connected to the discharge port 26 via the connection portion 18a of the second side wall 18. The exhaust duct 27 has an elongated tubular shape made of metal. The volume inside the exhaust duct 27 is smaller than the volume inside the case 15. The axis L1 of the exhaust duct 27 extends in the horizontal direction. The inlet 27a of the exhaust duct 27 communicates with the exhaust port 26 via the opening / closing portion 28 described later, and the outlet 27b of the exhaust duct 27 is outside the vehicle interior space 10a and opens toward the outside of the vehicle 10. Is located in.

図５に示すように、電池パック１４は、排出口２６を開閉するための開閉部２８を排気ダクト２７上に備える。開閉部２８は内部に圧力開放部２８ａを備える。接続部１８ａと開閉部２８、及び排気ダクト２７と開閉部２８はねじ締結により接合されている。なお、それぞれの接合方法はねじ締結に限定されず、溶接等の通常用いられる接合方法でもよい。開閉部２８の圧力開放部２８ａは、ケース１５の内圧が一定値まで上昇したときに破断し、開閉部２８が開いた状態になってケース１５の内圧を開放する。「一定値」は、ケース１５の内圧が高まったときに、ケース１５の内圧によってケース１５が破損する前に開閉部２８が破断するような圧力に設定される。 As shown in FIG. 5, the battery pack 14 includes an opening / closing portion 28 for opening / closing the discharge port 26 on the exhaust duct 27. The opening / closing portion 28 includes a pressure releasing portion 28a inside. The connection portion 18a and the opening / closing portion 28, and the exhaust duct 27 and the opening / closing portion 28 are joined by screw fastening. In addition, each joining method is not limited to screw fastening, and may be a commonly used joining method such as welding. The pressure release portion 28a of the opening / closing portion 28 breaks when the internal pressure of the case 15 rises to a certain value, and the opening / closing portion 28 is in an open state to release the internal pressure of the case 15. The "constant value" is set to a pressure at which the opening / closing portion 28 breaks before the case 15 is damaged by the internal pressure of the case 15 when the internal pressure of the case 15 increases.

上述したように、圧力開放弁２５が破断し、二次電池２０からガスが噴出したとき、開閉部２８が閉じた状態にあると、ケース１５の内圧は上昇する。このとき、排気ダクト２７の内圧は大気圧のままであり、排気ダクト２７の内圧は上昇しない。そして、ケース１５の内圧が排気ダクト２７の内圧より高くなり、ケース１５と排気ダクト２７との間に差圧が生じる。ケース１５の内圧が一定値まで上昇して圧力開放部２８ａが破断し、開閉部２８が開くと、排出口２６を介してケース１５と排気ダクト２７とが連通し、ケース１５内の一酸化炭素が排気ダクト２７に流入する。排気ダクト２７において、一酸化炭素が流れる方向を排気方向Ｘとする。 As described above, when the pressure release valve 25 breaks and the gas is ejected from the secondary battery 20, if the opening / closing portion 28 is in the closed state, the internal pressure of the case 15 rises. At this time, the internal pressure of the exhaust duct 27 remains at atmospheric pressure, and the internal pressure of the exhaust duct 27 does not increase. Then, the internal pressure of the case 15 becomes higher than the internal pressure of the exhaust duct 27, and a differential pressure is generated between the case 15 and the exhaust duct 27. When the internal pressure of the case 15 rises to a certain value, the pressure release portion 28a breaks, and the opening / closing portion 28 opens, the case 15 and the exhaust duct 27 communicate with each other via the discharge port 26, and carbon monoxide in the case 15 is used. Flows into the exhaust duct 27. In the exhaust duct 27, the direction in which carbon monoxide flows is defined as the exhaust direction X.

図２又は図５に示すように、排気ダクト２７は、排気ダクト２７の外周面の一部が円形状に開口した給気口２７ｃを備える。給気口２７ｃは、排気ダクト２７の内外を連通させる。給気口２７ｃは、排気ダクト２７の外周面から下方に向けて開口している。給気口２７ｃの中心軸は、排気ダクト２７の軸線Ｌ１と直交している。給気口２７ｃは、排気方向Ｘにおける開閉部２８よりも下流側に位置する。 As shown in FIG. 2 or FIG. 5, the exhaust duct 27 includes an air supply port 27c in which a part of the outer peripheral surface of the exhaust duct 27 is open in a circular shape. The air supply port 27c communicates the inside and outside of the exhaust duct 27. The air supply port 27c opens downward from the outer peripheral surface of the exhaust duct 27. The central axis of the air supply port 27c is orthogonal to the axis L1 of the exhaust duct 27. The air supply port 27c is located on the downstream side of the opening / closing portion 28 in the exhaust direction X.

排気ダクト２７は、長手方向の一部の外周面から下方に向けて筒状に突出した給気接続部２７ｄを備える。給気接続部２７ｄは、給気口２７ｃを囲むように形成されている。給気接続部２７ｄは、給気接続部２７ｄの中心軸と給気口２７ｃの中心軸が一致するように配置されている。本実施形態では、給気口２７ｃの口径と給気接続部２７ｄの内径は一致している。なお、給気口２７ｃの口径と給気接続部２７ｄの内径は一致していなくてもよく、給気口２７ｃの口径に対して給気接続部２７ｄの内径が小さくてもよいし、大きくてもよい。 The exhaust duct 27 includes an air supply connecting portion 27d that projects downward in a cylindrical shape from a part of the outer peripheral surface in the longitudinal direction. The air supply connection portion 27d is formed so as to surround the air supply port 27c. The supply air connection portion 27d is arranged so that the central axis of the supply air connection portion 27d and the central axis of the air supply port 27c coincide with each other. In the present embodiment, the diameter of the air supply port 27c and the inner diameter of the air supply connection portion 27d are the same. The diameter of the air supply port 27c and the inner diameter of the air supply connection portion 27d do not have to match, and the inner diameter of the air supply connection portion 27d may be smaller or larger than the diameter of the air supply port 27c. May be good.

電池パック１４は、給気接続部２７ｄを介して給気口２７ｃに接続される給気ダクト２９を備える。給気ダクト２９の軸線Ｌ２は、上下方向に延び、給気ダクト２９の軸線Ｌ２は、排気ダクト２７の軸線Ｌ１に直交している。給気ダクト２９の入口２９ａは、下を向き、車両１０の外で大気に開口している。給気ダクト２９の出口２９ｂは、後述する逆止弁３０を介して給気口２７ｃに連通している。電池パック１４は、給気口２７ｃを開閉する逆止弁３０を給気ダクト２９上に備える。給気接続部２７ｄと逆止弁３０、及び給気ダクト２９と逆止弁３０はねじ締結により接合されている。なお、それぞれの接合方法はねじ締結に限定されず、溶接等の通常用いられる接合方法でもよい。 The battery pack 14 includes an air supply duct 29 connected to the air supply port 27c via the air supply connection portion 27d. The axis L2 of the air supply duct 29 extends in the vertical direction, and the axis L2 of the air supply duct 29 is orthogonal to the axis L1 of the exhaust duct 27. The inlet 29a of the air supply duct 29 faces downward and is open to the atmosphere outside the vehicle 10. The outlet 29b of the air supply duct 29 communicates with the air supply port 27c via a check valve 30, which will be described later. The battery pack 14 is provided with a check valve 30 on the air supply duct 29 that opens and closes the air supply port 27c. The air supply connection portion 27d and the check valve 30, and the air supply duct 29 and the check valve 30 are joined by screw fastening. In addition, each joining method is not limited to screw fastening, and may be a commonly used joining method such as welding.

逆止弁３０は、内部に弁体３１を備える。排気ダクト２７の内圧が負圧となり、給気ダクト２９の内圧より低くなると、排気ダクト２７と給気ダクト２９との間に一定の差圧が生じる。すると、逆止弁３０の弁体３１は開弁状態となり、給気ダクト２９から排気ダクト２７への空気の流入を許容する。一方で、逆止弁３０の弁体３１は、排気ダクト２７の内圧が、給気ダクト２９の内圧より高いときは閉弁状態となり、給気口２７ｃを介した排気ダクト２７からの一酸化炭素の排出を抑止し、給気ダクト２９への一酸化炭素の排出を阻止する。 The check valve 30 includes a valve body 31 inside. When the internal pressure of the exhaust duct 27 becomes a negative pressure and becomes lower than the internal pressure of the air supply duct 29, a constant differential pressure is generated between the exhaust duct 27 and the air supply duct 29. Then, the valve body 31 of the check valve 30 is opened, and the inflow of air from the air supply duct 29 to the exhaust duct 27 is allowed. On the other hand, the valve body 31 of the check valve 30 is closed when the internal pressure of the exhaust duct 27 is higher than the internal pressure of the air supply duct 29, and the carbon monoxide from the exhaust duct 27 via the air supply port 27c is closed. And prevent the emission of carbon monoxide to the air supply duct 29.

図６に示すように、逆止弁３０の弁体３１が開弁すると、給気ダクト２９の入口２９ａから給気ダクト２９内に空気が流入し、空気は給気口２７ｃに向けて流れ、給気ダクト２９の出口２９ｂから給気口２７ｃを介して排気ダクト２７内に流入する。逆止弁３０の開弁時に給気ダクト２９を空気が流れる方向を給気方向Ｙとする。本実施形態では、給気方向Ｙは、給気ダクト２９の軸線Ｌ２の延びる方向と一致する。 As shown in FIG. 6, when the valve body 31 of the check valve 30 is opened, air flows into the air supply duct 29 from the inlet 29a of the air supply duct 29, and the air flows toward the air supply port 27c. It flows into the exhaust duct 27 from the outlet 29b of the air supply duct 29 through the air supply port 27c. The direction in which air flows through the air supply duct 29 when the check valve 30 is opened is defined as the air supply direction Y. In the present embodiment, the air supply direction Y coincides with the extending direction of the axis L2 of the air supply duct 29.

次に、電池パック１４の作用を記載する。
図６に示すように、電池パック１４が備える複数の二次電池２０の中の一つにおいて、電極組立体２１ａに熱暴走が発生し、電池ケース２１の内圧が規定圧力を超えると、圧力開放弁２５が破断する。すると、電池ケース２１の内圧が開放されるとともに、破断した圧力開放弁２５から電池ケース２１内のガスが噴出する。このとき、ガスに引火したとしても、ケース１５内が酸素欠乏状態となり、類焼が阻止される一方で、ケース１５内には有害ガスである一酸化炭素が発生する。 Next, the operation of the battery pack 14 will be described.
As shown in FIG. 6, in one of the plurality of secondary batteries 20 included in the battery pack 14, thermal runaway occurs in the electrode assembly 21a, and when the internal pressure of the battery case 21 exceeds the specified pressure, the pressure is released. The valve 25 breaks. Then, the internal pressure of the battery case 21 is released, and the gas in the battery case 21 is ejected from the broken pressure release valve 25. At this time, even if the gas ignites, the inside of the case 15 becomes oxygen-deficient and the burning is prevented, while carbon monoxide, which is a harmful gas, is generated in the case 15.

圧力開放弁２５が破断した直後は、ケース１５の内圧は比較的低く、図５に示すように、開閉部２８は閉じた状態にある。その後、ケース１５の内圧が上昇して排気ダクト２７の内圧より高くなる一方で、排気ダクト２７の内圧は大気圧のままであるため、ケース１５と排気ダクト２７との間に差圧が生じる。すると、圧力開放部２８ａが破断して開閉部２８が開き、図６に示すように、排出口２６を介してケース１５と排気ダクト２７とが連通する。ケース１５内の一酸化炭素は排気ダクト２７に流れ込み、一定の流速が生じると、排気ダクト２７内に負圧が発生する。そして、排気ダクト２７の内圧と給気ダクト２９との内圧との間に一定の差圧が生じると、逆止弁３０が開弁し、給気ダクト２９の入口２９ａと給気口２７ｃとが連通し、給気ダクト２９から排気ダクト２７内に空気が供給される。すると、排気ダクト２７を流れる一酸化炭素に空気中の酸素（Ｏ２）が混合され、一酸化炭素が酸化される。その結果、一酸化炭素が二酸化炭素（ＣＯ２）となり、二酸化炭素が車両１０から大気へ排出される。 Immediately after the pressure release valve 25 breaks, the internal pressure of the case 15 is relatively low, and as shown in FIG. 5, the opening / closing portion 28 is in a closed state. After that, while the internal pressure of the case 15 rises and becomes higher than the internal pressure of the exhaust duct 27, the internal pressure of the exhaust duct 27 remains at atmospheric pressure, so that a differential pressure is generated between the case 15 and the exhaust duct 27. Then, the pressure release portion 28a breaks and the opening / closing portion 28 opens, and as shown in FIG. 6, the case 15 and the exhaust duct 27 communicate with each other via the discharge port 26. Carbon monoxide in the case 15 flows into the exhaust duct 27, and when a constant flow velocity is generated, a negative pressure is generated in the exhaust duct 27. When a constant differential pressure is generated between the internal pressure of the exhaust duct 27 and the internal pressure of the air supply duct 29, the check valve 30 is opened and the inlet 29a and the air supply port 27c of the air supply duct 29 are opened. Air is supplied from the air supply duct 29 into the exhaust duct 27 through communication. Then, oxygen (O 2 ) in the air is mixed with the carbon monoxide flowing through the exhaust duct 27, and the carbon monoxide is oxidized. As a result, carbon monoxide becomes carbon dioxide (CO 2 ), and carbon dioxide is discharged from the vehicle 10 to the atmosphere.

上記実施形態によれば、以下のような効果を得ることができる。
（１）ケース１５の排出口２６に接続した排気ダクト２７に給気口２７ｃを設けた。そして、ケース１５内の一酸化炭素が排気ダクト２７の出口２７ｂから大気へ排出される前に給気口２７ｃから排気ダクト２７内に空気を供給できる。このため、一酸化炭素を酸化して、二酸化炭素としてケース１５外へ排出でき、有害な一酸化炭素がケース１５外の大気へ放出されることを抑制できる。 According to the above embodiment, the following effects can be obtained.
(1) An air supply port 27c is provided in the exhaust duct 27 connected to the discharge port 26 of the case 15. Then, air can be supplied into the exhaust duct 27 from the air supply port 27c before the carbon monoxide in the case 15 is discharged to the atmosphere from the outlet 27b of the exhaust duct 27. Therefore, carbon monoxide can be oxidized and discharged as carbon dioxide to the outside of the case 15, and harmful carbon monoxide can be suppressed from being released to the atmosphere outside the case 15.

（２）電池パック１４は、ケース１５の排出口２６に開閉部２８を備える。開閉部２８が閉じた状態にあるときに二次電池２０からガスが噴出すると、ケース１５の内圧は上昇する一方で排気ダクト２７の内圧は大気圧のままである。このため、開閉部２８を設けることで、ケース１５の内圧と排気ダクト２７の内圧に差圧を生じさせやすく、開閉部２８が開いたときには、ケース１５から排気ダクト２７に一酸化炭素を流しやすくして流速を速め、排気ダクト２７に負圧を発生させやすくなる。その結果、逆止弁３０を開いて給気ダクト２９から排気ダクト２７に空気を供給しやすくなる。 (2) The battery pack 14 includes an opening / closing portion 28 at the discharge port 26 of the case 15. If gas is ejected from the secondary battery 20 while the opening / closing portion 28 is in the closed state, the internal pressure of the case 15 rises, while the internal pressure of the exhaust duct 27 remains at atmospheric pressure. Therefore, by providing the opening / closing portion 28, it is easy to generate a differential pressure between the internal pressure of the case 15 and the internal pressure of the exhaust duct 27, and when the opening / closing portion 28 is opened, carbon monoxide is easily flowed from the case 15 to the exhaust duct 27. This speeds up the flow velocity and makes it easier to generate a negative pressure in the exhaust duct 27. As a result, the check valve 30 is opened to facilitate supply of air from the air supply duct 29 to the exhaust duct 27.

（３）給気口２７ｃは、ケース１５の排出口２６及び排気ダクト２７の入口２７ａよりも排気方向Ｘの下流側に設けられ、排気方向Ｘに沿って排出口２６及び入口２７ａから離れた位置にある。このため、給気ダクト２９から供給された空気は、入口２７ａ及び排出口２６を介してケース１５内に流入しにくい。よって、二次電池２０の熱暴走時に空気がケース１５内に取り込まれて熱暴走を加速させることを防止できる。 (3) The air supply port 27c is provided on the downstream side of the exhaust direction X from the exhaust port 26 of the case 15 and the inlet 27a of the exhaust duct 27, and is located away from the exhaust port 26 and the inlet 27a along the exhaust direction X. It is in. Therefore, the air supplied from the air supply duct 29 is unlikely to flow into the case 15 through the inlet 27a and the discharge port 26. Therefore, it is possible to prevent air from being taken into the case 15 and accelerating the thermal runaway during the thermal runaway of the secondary battery 20.

なお、上記実施形態は以下のように変更してもよい。
○ 図７に示すように、給気ダクト２９の入口２９ａが、車両１０の前方に向けて開口するように、給気ダクト２９の軸線Ｌ２を斜めに傾けて設けてもよい。このように構成した場合、車両１０の走行中には、給気ダクト２９の入口２９ａに空気が自然に流入してくる。このため、二次電池２０の異常時、給気ダクト２９から排気ダクト２７内に効率良く空気を供給できる。 The above embodiment may be changed as follows.
○ As shown in FIG. 7, the axis L2 of the air supply duct 29 may be provided at an angle so that the inlet 29a of the air supply duct 29 opens toward the front of the vehicle 10. With this configuration, air naturally flows into the inlet 29a of the air supply duct 29 while the vehicle 10 is traveling. Therefore, when the secondary battery 20 is abnormal, air can be efficiently supplied from the air supply duct 29 into the exhaust duct 27.

なお、給気ダクト２９の入口２９ａが、車両１０の前方に向けて開口していれば、給気ダクト２９の軸線Ｌ２が、排気ダクト２７の軸線Ｌ１に対し斜めに交差するように給気ダクト２９が設けられていてもよい。又は、給気ダクト２９の軸線Ｌ２のほとんどが排気ダクト２７の軸線Ｌ１に直交して鉛直方向に延びつつ、入口２９ａ付近のみが屈曲していてもよい。 If the inlet 29a of the air supply duct 29 is open toward the front of the vehicle 10, the air supply duct 29 so that the axis L2 of the air supply duct 29 diagonally intersects the axis L1 of the exhaust duct 27. 29 may be provided. Alternatively, most of the axis L2 of the air supply duct 29 may extend in the vertical direction orthogonal to the axis L1 of the exhaust duct 27, and only the vicinity of the inlet 29a may be bent.

○ 給気ダクト２９の軸線Ｌ２が排気ダクト２７の軸線Ｌ１に対し斜めに交差するように、給気ダクト２９を配置する。このとき、給気ダクト２９の入口２９ａを給気口２７ｃよりも排気方向Ｘの上流側で開口するように給気ダクト２９を斜めにする。そして、給気ダクト２９の給気方向Ｙが排気ダクト２７における排気方向Ｘに沿うように、給気ダクト２９を給気口２７ｃに接続する。 ○ The air supply duct 29 is arranged so that the axis L2 of the air supply duct 29 intersects the axis L1 of the exhaust duct 27 at an angle. At this time, the air supply duct 29 is slanted so that the inlet 29a of the air supply duct 29 opens on the upstream side of the exhaust direction X from the air supply port 27c. Then, the air supply duct 29 is connected to the air supply port 27c so that the air supply direction Y of the air supply duct 29 is along the exhaust direction X in the exhaust duct 27.

このように構成した場合、逆止弁３０が開弁し、給気ダクト２９の入口２９ａから給気口２７ｃに空気が流れると、給気ダクト２９における給気方向Ｙが、排気ダクト２７における排気方向Ｘに沿うようになり、排気ダクト２７を流れる一酸化炭素に対し、給気ダクト２９から空気が供給しやすく、混ざりやすい。 In this configuration, when the check valve 30 opens and air flows from the inlet 29a of the air supply duct 29 to the air supply port 27c, the air supply direction Y in the air supply duct 29 changes to the exhaust in the exhaust duct 27. Air is easily supplied from the air supply duct 29 to the carbon monoxide flowing in the exhaust duct 27 along the direction X, and is easily mixed.

○ 図８に示すように、電池パック１４のケース１５内に圧力センサ５０を配置し、ケース１５の内圧を圧力センサ５０によって検出するようにする。また、排気ダクト２７における開閉部を電磁弁５１によって構成するとともに、逆止弁も電磁弁５２により構成する。電池パック１４を制御する制御部５３に電磁弁５１，５２を信号接続するとともに、圧力センサ５０を信号接続する。さらに、給気ダクト２９の入口２９ａ付近に給気ファン５４を配置するとともに、給気ファン５４も制御部５３に信号接続する。また、排気ダクト２７内にダクト用圧力センサ５５を配置し、排気ダクト２７の内圧をダクト用圧力センサ５５によって検出するようにする。このダクト用圧力センサ５５も制御部５３に信号接続する。 ○ As shown in FIG. 8, a pressure sensor 50 is arranged in the case 15 of the battery pack 14, and the internal pressure of the case 15 is detected by the pressure sensor 50. Further, the opening / closing portion of the exhaust duct 27 is configured by the solenoid valve 51, and the check valve is also configured by the solenoid valve 52. The solenoid valves 51 and 52 are signal-connected to the control unit 53 that controls the battery pack 14, and the pressure sensor 50 is also signal-connected. Further, the air supply fan 54 is arranged near the inlet 29a of the air supply duct 29, and the air supply fan 54 is also signal-connected to the control unit 53. Further, a duct pressure sensor 55 is arranged in the exhaust duct 27 so that the internal pressure of the exhaust duct 27 is detected by the duct pressure sensor 55. The duct pressure sensor 55 is also signal-connected to the control unit 53.

そして、制御部５３は、圧力センサ５０から取得した測定値が一定値を超えると、電磁弁５１を開弁させる。すると、排出口２６を介してケース１５と排気ダクト２７とが連通するとともに、ケース１５内の一酸化炭素は排気ダクト２７に流れ込む。 Then, when the measured value acquired from the pressure sensor 50 exceeds a certain value, the control unit 53 opens the solenoid valve 51. Then, the case 15 and the exhaust duct 27 communicate with each other through the exhaust port 26, and the carbon monoxide in the case 15 flows into the exhaust duct 27.

制御部５３は、ダクト用圧力センサ５５から取得した測定値が、給気ダクト２９の内圧である大気圧より低くなり、一定の差圧が生じると、制御部５３は電磁弁５２を開弁させるとともに、給気ファン５４を駆動させる。すると、給気ダクト２９の入口２９ａと給気口２７ｃとが連通し、給気ファン５４から送られた空気が、給気ダクト２９内に強制的に供給されるとともに、その空気が排気ダクト２７内に供給される。すると、排気ダクト２７を流れる一酸化炭素に空気が混合され、一酸化炭素が酸化され、二酸化炭素が発生し、二酸化炭素として車室空間１０ａに排出される。 When the measured value acquired from the duct pressure sensor 55 becomes lower than the atmospheric pressure which is the internal pressure of the air supply duct 29 and a constant differential pressure is generated, the control unit 53 opens the solenoid valve 52. At the same time, the air supply fan 54 is driven. Then, the inlet 29a of the air supply duct 29 and the air supply port 27c communicate with each other, and the air sent from the air supply fan 54 is forcibly supplied into the air supply duct 29, and the air is discharged into the exhaust duct 27. Supplied within. Then, air is mixed with carbon monoxide flowing through the exhaust duct 27, carbon monoxide is oxidized, carbon dioxide is generated, and carbon dioxide is discharged into the vehicle interior space 10a.

○ 給気口２７ｃを排気ダクト２７の排気方向Ｘに沿って複数設けるとともに、各給気口２７ｃに給気ダクト２９を接続し、排気ダクト２７に対し、複数箇所から給気してもよい。 ○ A plurality of air supply ports 27c may be provided along the exhaust direction X of the exhaust duct 27, and an air supply duct 29 may be connected to each air supply port 27c to supply air to the exhaust duct 27 from a plurality of locations.

○ 電池パック１４は、車室空間１０ａではなく、車両１０における車室空間１０ａの外側に搭載してもよい。この場合、排気ダクト２７の出口２７ｂは、車両１０の外にむけて開口していてもよいし、車両１０内で開口していてもよい。 ○ The battery pack 14 may be mounted outside the vehicle interior space 10a in the vehicle 10 instead of the vehicle interior space 10a. In this case, the outlet 27b of the exhaust duct 27 may be open toward the outside of the vehicle 10 or may be open inside the vehicle 10.

○ 開閉部２８は無くてもよい。この場合、ケース１５の排出口２６は排気ダクト２７の入口２７ａと常に連通し、二次電池２０からガスが放出されていないときは、ケース１５の内圧及び排気ダクト２７の内圧は大気圧である。 ○ The opening / closing portion 28 may be omitted. In this case, the discharge port 26 of the case 15 always communicates with the inlet 27a of the exhaust duct 27, and when the gas is not discharged from the secondary battery 20, the internal pressure of the case 15 and the internal pressure of the exhaust duct 27 are atmospheric pressure. ..

しかし、圧力開放弁２５が破断し、二次電池２０からガスが放出されたとき、ケース１５の内圧に対し排気ダクト２７の内圧が負圧になるように、排気ダクト２７の流路断面積を調節する。 However, when the pressure release valve 25 breaks and the gas is discharged from the secondary battery 20, the cross-sectional area of the flow path of the exhaust duct 27 is adjusted so that the internal pressure of the exhaust duct 27 becomes a negative pressure with respect to the internal pressure of the case 15. Adjust.

○ 二次電池２０は、リチウムイオン二次電池に限定されず、ニッケル水素二次電池など、他の二次電池であってもよい。要は、正極用の活物質と負極用の活物質との間をイオンが移動するとともに電荷の授受を行うものであればよい。 ○ The secondary battery 20 is not limited to the lithium ion secondary battery, and may be another secondary battery such as a nickel hydrogen secondary battery. In short, it suffices as long as the ions move between the active material for the positive electrode and the active material for the negative electrode and transfer charges.

○ 排出口２６の位置は、ケース１５の上端以外の場所であってもよい。
○ 給気ダクト２９を削除し、給気口２７ｃから排気ダクト２７に直接給気を行うようにしてもよい。 ○ The position of the discharge port 26 may be a place other than the upper end of the case 15.
○ The air supply duct 29 may be deleted to directly supply air to the exhaust duct 27 from the air supply port 27c.

Ｘ…排気方向、Ｙ…給気方向、１０…車両、１４…電池パック、１５…ケース、２０…二次電池、２１…電池ケース、２１ａ…電極組立体、２５…圧力開放弁、２６…排出口、２７…排気ダクト、２９ａ…入口、２７ｃ…給気口、２８…開閉部、２９…給気ダクト、３０…逆止弁、５４…給気ファン。 X ... exhaust direction, Y ... air supply direction, 10 ... vehicle, 14 ... battery pack, 15 ... case, 20 ... secondary battery, 21 ... battery case, 21a ... electrode assembly, 25 ... pressure release valve, 26 ... exhaust Outlet, 27 ... Exhaust duct, 29a ... Inlet, 27c ... Air supply port, 28 ... Opening and closing part, 29 ... Air supply duct, 30 ... Check valve, 54 ... Air supply fan.

Claims (5)

電池ケース内に電解液及び電極組立体が収容され、前記電池ケースの内圧が規定圧力を超えた場合に前記電池ケースの内圧を開放する圧力開放弁を有する複数の二次電池と、
複数の前記二次電池を収容する密閉状のケースと、
前記ケース内に発生した一酸化炭素を当該ケースの外へ排出するために前記ケースに設けられた排出口と、
前記排出口に接続され、当該排出口から前記ケースの外へ排出された前記一酸化炭素が流れる排気ダクトと、
前記排気ダクトに空気を流入させるために当該排気ダクトに設けられた給気口と、
前記排気ダクトの内圧が負圧となったときに前記給気口から前記排気ダクトへの空気の流入を許容する一方で、前記排気ダクトを流れる前記一酸化炭素が前記給気口から排出されることを抑止する逆止弁と、を有し、
前記圧力開放弁によって前記電池ケースの内圧が開放されたときの前記ケースの内圧に対し前記排気ダクトの内圧が負圧になるように設定されている電池パック。 A plurality of secondary batteries having an electrolytic solution and an electrode assembly housed in the battery case and having a pressure release valve for releasing the internal pressure of the battery case when the internal pressure of the battery case exceeds a specified pressure.
A sealed case that houses the plurality of the secondary batteries,
A discharge port provided in the case for discharging carbon monoxide generated in the case to the outside of the case, and a discharge port provided in the case.
An exhaust duct connected to the exhaust port and through which the carbon monoxide discharged from the discharge port to the outside of the case flows.
An air supply port provided in the exhaust duct for allowing air to flow into the exhaust duct, and
When the internal pressure of the exhaust duct becomes negative, the inflow of air from the air supply port to the exhaust duct is allowed, while the carbon monoxide flowing through the exhaust duct is discharged from the air supply port. It has a check valve, which suppresses that,
A battery pack set so that the internal pressure of the exhaust duct becomes a negative pressure with respect to the internal pressure of the case when the internal pressure of the battery case is released by the pressure release valve. 前記排出口を開閉する開閉部を備え、前記排気ダクトは、前記開閉部を介して前記排出口に接続されている請求項１に記載の電池パック。 The battery pack according to claim 1, further comprising an opening / closing portion for opening / closing the discharge port, wherein the exhaust duct is connected to the discharge port via the opening / closing portion. 前記電池パックは、車両に搭載されるとともに前記給気口に接続される給気ダクトを備え、前記給気ダクトの入口は、前記車両の前方に向けて開口している請求項１又は請求項２に記載の電池パック。 The battery pack is mounted on a vehicle and includes an air supply duct connected to the air supply port, and the inlet of the air supply duct is open toward the front of the vehicle according to claim 1 or claim. The battery pack described in 2. 前記電池パックは、車両に搭載されるとともに前記給気口に接続される給気ダクトを備え、前記ケースから排出された前記一酸化炭素が前記排気ダクトを流れる方向を排気方向とし、前記給気ダクトにおいて前記給気口に向けて空気の流れる方向を給気方向とすると、前記給気ダクトは、前記給気方向が前記排気方向に沿うように前記給気口に接続されている請求項１又は請求項２に記載の電池パック。 The battery pack is provided with an air supply duct that is mounted on a vehicle and is connected to the air supply port, and the direction in which the carbon monoxide discharged from the case flows through the exhaust duct is defined as the exhaust direction. Assuming that the direction in which air flows toward the air supply port in the duct is the air supply direction, the air supply duct is connected to the air supply port so that the air supply direction is along the exhaust direction. Or the battery pack according to claim 2. 前記電池パックは、車両に搭載されるとともに前記給気口に接続される給気ダクトを備え、前記給気ダクトの入口に向けて空気を送る給気ファンを備える請求項１又は請求項２に記載の電池パック。 According to claim 1 or 2, the battery pack includes an air supply duct mounted on a vehicle and connected to the air supply port, and includes an air supply fan for sending air toward the inlet of the air supply duct. The listed battery pack.
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