JP2014071939A - Battery pack, and power supply device having the same - Google Patents

Battery pack, and power supply device having the same Download PDF

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JP2014071939A
JP2014071939A JP2012214528A JP2012214528A JP2014071939A JP 2014071939 A JP2014071939 A JP 2014071939A JP 2012214528 A JP2012214528 A JP 2012214528A JP 2012214528 A JP2012214528 A JP 2012214528A JP 2014071939 A JP2014071939 A JP 2014071939A
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battery
battery pack
ribs
batteries
case
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JP5984009B2 (en
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Katsu Takemura
克 武村
Akira Yamamori
章 山森
Hirotoshi Tatsumi
浩俊 辰巳
Hiroki Takeshima
宏樹 竹島
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Panasonic 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
    • 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

PROBLEM TO BE SOLVED: To provide a battery pack capable of preventing generation of short circuit of a battery via a leaked electrolyte.SOLUTION: A battery pack 100 comprises a plurality of cylindrical batteries 1, and a holder 10 holding the batteries 1. The holder 10 has a bottomed box-like case 11 opening at one end, and a plurality of cylindrical ribs 12 arranged on an inner bottom face of the case 11. The plurality of ribs 12 are arranged at least in one row. The lower parts of the batteries 1 are inserted into the ribs 12 respectively, and the plurality of batteries 1 include at least a plurality of batteries connected in series. Each rib 12 has a notch part 7 where a height of a side wall of the rib 12 becomes lower than the other portions, at a portion separated in a circumferential direction from opposed portions of the ribs 12 adjacent to each other.

Description

本発明は、複数の電池を備えた電池パック、及びそれを備えた電源装置に関する。   The present invention relates to a battery pack including a plurality of batteries and a power supply device including the battery pack.

一般に、二次電池は、電池内の内圧が上昇したときに、電池内の圧力を開放する安全弁を備えている。このような二次電池を複数個並べて、ケース内に収容して電池パックを構成した場合、ある電池の安全弁が作動して、電解液がケース内に漏出すると、電解液は導電性を有するため、電解液を介して、電池同士が短絡するおそれがある。   In general, the secondary battery includes a safety valve that releases the pressure in the battery when the internal pressure in the battery increases. When a plurality of such secondary batteries are arranged and accommodated in a case to constitute a battery pack, if the safety valve of a certain battery is activated and the electrolyte leaks into the case, the electrolyte has conductivity. The batteries may be short-circuited through the electrolytic solution.

このような問題に対して、特許文献１には、複数の電池を下から支持する支持部材に、各電池から漏出した電解液を受けるための凹部を、各電池毎に個別に設けた電池パックが記載されている。仮に、電池から電解液が漏出しても、電解液は、漏出した電池に対応した凹部に独立して留まるため、他の電池に接触するのを防止することができる。   In order to solve such a problem, Patent Document 1 discloses a battery pack in which a concave portion for receiving an electrolytic solution leaked from each battery is provided for each battery in a support member that supports a plurality of batteries from below. Is described. Even if the electrolyte leaks out from the battery, the electrolyte stays independently in the recess corresponding to the leaked battery, so that it can be prevented from coming into contact with another battery.

特開２００９−１４６６０６号公報JP 2009-146606 A

特許文献１に記載された電池パックでは、電池の外側面と凹部の内側面との間に、数ｍｍ程度のクリアランスがあり、その隙間に、電解液が溜まる。そのため、複数の電池を高密度に配列した電池パックでは、隣接する電池の凹部同士が接近しているため、電解液が漏出した電池の凹部に溜まった電解液が溢れて、隣の電池の凹部に入り込むと、電解液を介して、電池の短絡が発生するおそれがある。また、複数の電池パックを集合させて電源装置を構成した場合、電池から漏出した電解液が、電池パックの外に流出すると、電解液を介して、電池パックの短絡が発生するおそれもある。   In the battery pack described in Patent Document 1, there is a clearance of about several millimeters between the outer surface of the battery and the inner surface of the recess, and the electrolyte accumulates in the gap. Therefore, in a battery pack in which a plurality of batteries are arranged at high density, the concave portions of adjacent batteries are close to each other, so that the electrolytic solution accumulated in the concave portion of the battery from which the electrolyte has leaked overflows, and the concave portion of the adjacent battery If it enters, there is a possibility that a short circuit of the battery may occur through the electrolytic solution. Further, when a power supply device is configured by collecting a plurality of battery packs, if the electrolyte leaked from the battery flows out of the battery pack, the battery pack may be short-circuited via the electrolyte.

本発明は、かかる課題に鑑みなされたもので、その主な目的は、漏出した電解液を介した電池の短絡発生を防止した電池パックを提供することにある。また、複数の電池パックを集合した電源装置において、漏出した電解液を介した電池パックの短絡発生を防止した電源装置を提供することにある。   This invention is made | formed in view of this subject, The main objective is to provide the battery pack which prevented the short circuit generation | occurrence | production of the battery through the leaked electrolyte solution. It is another object of the present invention to provide a power supply apparatus that prevents a short circuit from occurring in a battery pack via a leaked electrolyte in a power supply apparatus in which a plurality of battery packs are assembled.

上記の課題を解決するために、本発明は、複数の電池を備えた電池パックにおいて、複数の電池を保持するホルダーに、各電池を挿入する複数のリブを設け、互いに隣接するリブの対向する部位から周方向に離れた部位に、切り欠け部を設けた構成を採用する。   In order to solve the above problems, the present invention provides a battery pack including a plurality of batteries, wherein a plurality of ribs for inserting each battery are provided in a holder that holds the plurality of batteries, and the ribs adjacent to each other face each other. The structure which provided the notch part in the site | part distant from the site | part to the circumferential direction is employ | adopted.

すなわち、本発明に係る電池パックは、複数の円筒形の電池と、該電池を保持するホルダーとを備え、ホルダーは、一方が開口された有底箱形のケースと、該ケースの内底面に配設された複数の円筒形のリブとを有し、複数のリブは、少なくとも１列に配列されており、複数の電池は、該電池の下部が、それぞれ各リブに挿入され、かつ、直列接続されており、各リブは、互いに隣接するリブの対向する部位から周方向に離れた部位に、リブの側壁の高さが、他の部位よりも低くなった切り欠け部を有していることを特徴とする。   That is, the battery pack according to the present invention includes a plurality of cylindrical batteries and a holder for holding the batteries, and the holder has a bottomed box-shaped case opened on one side and an inner bottom surface of the case. A plurality of cylindrical ribs arranged, and the plurality of ribs are arranged in at least one row, and the plurality of batteries are inserted in the ribs at the lower portions of the batteries, respectively. Each rib is connected, and has a notch in which the height of the side wall of the rib is lower than the other part at a part away from the opposing part of the adjacent ribs in the circumferential direction. It is characterized by that.

このような構成により、電解液が漏出した電池が挿入されたリブに電解液が一杯になっても、隣接するリブの対向する部位から離れた部位に設けられた切り欠け部から、電解液が優先的に溢れるため、隣の電池が挿入されたリブに電解液が入り込むことを防止することができる。これにより、複数の電池を高密度に配列しても、電解液を介した電池の短絡発生を防止することができる。   With such a configuration, even when the electrolyte is full in the rib into which the battery from which the electrolyte has leaked is inserted, the electrolyte is discharged from the notch portion provided in the part away from the opposing part of the adjacent rib. Since it overflows preferentially, it is possible to prevent the electrolyte from entering the rib in which the adjacent battery is inserted. Thereby, even if it arranges a some battery at high density, the short circuit generation | occurrence | production of the battery through electrolyte solution can be prevented.

本発明によれば、複数の電池が直列接続された電池パックにおいて、漏出した電解液を介した電池の短絡発生を防止することができる。   According to the present invention, in a battery pack in which a plurality of batteries are connected in series, it is possible to prevent occurrence of a short circuit of the battery via the leaked electrolyte.

本発明の第１の実施形態における電池パックに使用される電池の構成を模式的に示した斜視図である。It is the perspective view which showed typically the structure of the battery used for the battery pack in the 1st Embodiment of this invention. 本発明の第１の実施形態における電池パックの構成を模式的に示した斜視図である。It is the perspective view which showed typically the structure of the battery pack in the 1st Embodiment of this invention. 本発明の第１の実施形態における電池パックの分解斜視図である。It is a disassembled perspective view of the battery pack in the 1st Embodiment of this invention. 本発明の第１の実施形態における第１のホルダーの斜視図である。It is a perspective view of the 1st holder in the 1st Embodiment of this invention. 本発明の第１の実施形態における第２のホルダーの斜視図である。It is a perspective view of the 2nd holder in the 1st Embodiment of the present invention. （ａ）は、隣接する電池における電解液を介した短絡の発生を示した概念図で、（ｂ）及び（ｃ）は、その等価回路図である。(A) is the conceptual diagram which showed generation | occurrence | production of the short circuit through the electrolyte solution in an adjacent battery, (b) and (c) are the equivalent circuit schematics. 本発明の第１の実施形態における電池パックの部分斜視図である。It is a fragmentary perspective view of the battery pack in the 1st Embodiment of this invention. 電解液が電池パック外に流出したときの電解液を介した短絡の発生を示した概念図で、（ｂ）はその等価回路図である。It is the conceptual diagram which showed generation | occurrence | production of the short circuit through electrolyte solution when electrolyte solution flows out of a battery pack, (b) is the equivalent circuit schematic. 電解液が電池パック外に流出したときの電解液を介した短絡の発生を示した概念図で、（ｂ）はその等価回路図である。It is the conceptual diagram which showed generation | occurrence | production of the short circuit through electrolyte solution when electrolyte solution flows out of a battery pack, (b) is the equivalent circuit schematic. 本発明の第２の実施形態における電池パックの部分斜視図である。It is a fragmentary perspective view of the battery pack in the 2nd Embodiment of this invention. 本発明の第２の実施形態に電池パックの変形例を示した部分断面図である。It is the fragmentary sectional view which showed the modification of the battery pack to the 2nd Embodiment of this invention.

以下、本発明の実施形態を図面に基づいて詳細に説明する。なお、本発明は、以下の実施形態に限定されるものではない。また、本発明の効果を奏する範囲を逸脱しない範囲で、適宜変更は可能である。さらに、他の実施形態との組み合わせも可能である。   Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In addition, this invention is not limited to the following embodiment. Moreover, it can change suitably in the range which does not deviate from the range which has the effect of this invention. Furthermore, combinations with other embodiments are possible.

（第１の実施形態）
図１は、本発明の第１の実施形態における電池パックに使用される電池の構成を模式的に示した斜視図である。 (First embodiment)
FIG. 1 is a perspective view schematically showing a configuration of a battery used in the battery pack according to the first embodiment of the present invention.

本実施形態における電池１は、円筒形の電池で、その種類は特に限定されないが、代表的には、ニッケル水素電池やリチウムイオン二次電池を用いることができる。   The battery 1 in the present embodiment is a cylindrical battery, and the type of the battery 1 is not particularly limited. Typically, a nickel hydrogen battery or a lithium ion secondary battery can be used.

図１に示すように、円筒形の電池ケース５内に、正極及び負極がセパレータを介して捲回された電極群が、電解液とともに収容されている。電池ケースの開口部は、封口板６で封口され、封口板６には、安全弁２が設けられている。また、封口板６には、正極端子３及び負極端子４が形成されている。なお、電池ケース５の側面及び底面の一部は、絶縁フィルムで被覆されているが、電池ケース５の底面の一部は、露出して負極になっている。   As shown in FIG. 1, an electrode group in which a positive electrode and a negative electrode are wound through a separator is accommodated in a cylindrical battery case 5 together with an electrolytic solution. The opening of the battery case is sealed with a sealing plate 6, and a safety valve 2 is provided on the sealing plate 6. The sealing plate 6 is formed with a positive electrode terminal 3 and a negative electrode terminal 4. In addition, although a part of the side surface and the bottom surface of the battery case 5 is covered with an insulating film, a part of the bottom surface of the battery case 5 is exposed and becomes a negative electrode.

図２は、本実施形態における複数の電池を備えた電池パックの構成を模式的に示した斜視図である。   FIG. 2 is a perspective view schematically showing a configuration of a battery pack including a plurality of batteries in the present embodiment.

図２に示すように、本実施形態における電池パック１００は、複数の円筒形の電池１が列方向Ａに配列され、かつ、直列接続されている。図２では、５個の電池１が、２列に配列されている。隣接する電池１同士の接続は、一方の電池１の正極端子３と他方の電池１の負極端子４とを、例えば、バスバーで接続することにより行われる。   As shown in FIG. 2, the battery pack 100 according to this embodiment includes a plurality of cylindrical batteries 1 arranged in the column direction A and connected in series. In FIG. 2, five batteries 1 are arranged in two rows. Adjacent batteries 1 are connected to each other by connecting the positive terminal 3 of one battery 1 and the negative terminal 4 of the other battery 1 with, for example, a bus bar.

複数の電池１は、一対の第１のホルダー１０及び第２のホルダー２０によって保持されている。また、一対の第１のホルダー１０及び第２のホルダー２０の列方向Ａに平行な両側部には、一対の外装板３０、３１が取り付けられている。   The plurality of batteries 1 are held by a pair of first holder 10 and second holder 20. A pair of exterior plates 30 and 31 are attached to both side portions of the pair of first holder 10 and second holder 20 that are parallel to the row direction A.

図３は、図２に示した電池パック１００の分解斜視図である。また、図４は、第１のホルダー１０の斜視図、図５は、第２のホルダー２０の斜視図である。   FIG. 3 is an exploded perspective view of the battery pack 100 shown in FIG. 4 is a perspective view of the first holder 10, and FIG. 5 is a perspective view of the second holder 20.

図４に示すように、第１のホルダー１０は、一方が開口された有底箱形のケース１１と、ケース１１の内底面に配設された複数の円筒形のリブ１２とを有している。ここで、複数のリブ１２は、列方向Ａに配列されている。   As shown in FIG. 4, the first holder 10 includes a bottomed box-shaped case 11 that is open on one side, and a plurality of cylindrical ribs 12 that are disposed on the inner bottom surface of the case 11. Yes. Here, the plurality of ribs 12 are arranged in the column direction A.

また、図５に示すように、第２のホルダー２０は、第１のホルダー１０のケース１１の幅Ｗと略同一の幅Ｗを有する板部材２１と、板部材２１の平面に形成された複数の円筒状の貫通孔２２とを有している。   As shown in FIG. 5, the second holder 20 includes a plate member 21 having a width W substantially the same as the width W of the case 11 of the first holder 10, and a plurality of plates formed on the plane of the plate member 21. And a cylindrical through hole 22.

図３に示すように、第１のホルダー１０の各リブ１２には、各電池１の下部が挿入され、第２のホルダー２０の各貫通孔２２には、各電池１の上部が挿入されている。また、一対の外装板３０、３１には、電池１の冷却用の複数の孔３０ａ、３１ａが設けられており、ケース１１及び板部材２１の列方向に平行な両側部に、一対の外装板３０、３１が取り付けられている。これにより、電池パック１００を構成する複数の電池１は、一対の第１のホルダー１０及び第２のホルダー２０によって保持される。   As shown in FIG. 3, the lower part of each battery 1 is inserted into each rib 12 of the first holder 10, and the upper part of each battery 1 is inserted into each through hole 22 of the second holder 20. Yes. The pair of exterior plates 30, 31 are provided with a plurality of holes 30 a, 31 a for cooling the battery 1, and a pair of exterior plates on both sides parallel to the row direction of the case 11 and the plate member 21. 30 and 31 are attached. Accordingly, the plurality of batteries 1 constituting the battery pack 100 are held by the pair of first holder 10 and second holder 20.

本実施形態において、電池１の外側面と、第１のホルダー１０のリブ１２の内側面との間には、数ｍｍ程度のクリアランスがあり、その隙間に、電解液が溜まる。しかしながら、複数の電池１を高密度に配列した電池パックでは、隣接する電池１のリブ１２同士が接近しているため、図６（ａ）に示したように、電解液が漏出した電池１Ａのリブ１２に溜まった電解液が溢れて、隣の電池１Ｂのリブ１２に入り込むと、電解液を介して、電池１Ａ、１Ｂで短絡が発生するおそれがある。   In the present embodiment, there is a clearance of about several millimeters between the outer surface of the battery 1 and the inner surface of the rib 12 of the first holder 10, and the electrolytic solution accumulates in the gap. However, in the battery pack in which a plurality of batteries 1 are arranged at high density, the ribs 12 of the adjacent batteries 1 are close to each other, and therefore, as shown in FIG. If the electrolyte accumulated in the ribs 12 overflows and enters the rib 12 of the adjacent battery 1B, a short circuit may occur in the batteries 1A and 1B via the electrolyte.

図６（ｂ）は、１列に配列した電池において、電池１Ａから漏出した電解液が、隣の電池１Ｂのリブ１２に入り込んだときの短絡モードを模式的に示した等価回路図である。この場合、１個の電池１Ｂにおいて短絡が生じる。その結果、電池１Ｂに短絡電流が流れ、電池１Ｂが発熱するおそれがある。   FIG. 6B is an equivalent circuit diagram schematically showing a short-circuit mode when the electrolyte solution leaked from the battery 1A enters the ribs 12 of the adjacent battery 1B in the batteries arranged in one row. In this case, a short circuit occurs in one battery 1B. As a result, a short-circuit current flows through the battery 1B, and the battery 1B may generate heat.

図６（ｃ）は、２列に配列した電池において、一方の列の電池１Ａから漏出した電解液が、他方の列で、電池１Ａに対向する電池１Ｂのリブ１２に入り込んだときの短絡モードを模式的に示した等価回路図である。この場合、７個の直列に接続された電池において、短絡が生じる。従って、１個の電池の短絡に比べて、電位差の大きな短絡が生じるため、非常に大きな短絡電流が流れ、電池パック全体が異常過熱するおそれがある。   FIG. 6C shows a short-circuit mode when the electrolyte leaked from the battery 1A in one row enters the rib 12 of the battery 1B facing the battery 1A in the other row in the batteries arranged in two rows. It is the equivalent circuit diagram which showed typically. In this case, a short circuit occurs in the seven batteries connected in series. Therefore, since a short circuit with a large potential difference occurs as compared with a short circuit of one battery, a very large short-circuit current flows, and the entire battery pack may be abnormally overheated.

なお、このような電解液を介した電池の短絡は、隣接する電池から同時に電解液が漏出した場合にも発生し得る。   Such a short circuit of the battery via the electrolytic solution can also occur when the electrolytic solution leaks from the adjacent battery at the same time.

このような電解液を介した電池の短絡は、電池を離して配列すれば回避することもできるが、電池パックの高密度化の要請に反する。   Such a short circuit of the battery via the electrolytic solution can be avoided if the batteries are arranged apart from each other, but it is against the demand for higher density of the battery pack.

そこで、本願発明者等は、隣接する電池を当接して配列した場合でも、電解液を介した短絡の発生を防止する方法を検討し、本発明を想到するに至った。   Accordingly, the inventors of the present application have studied the method for preventing the occurrence of a short circuit through the electrolytic solution even when adjacent batteries are arranged in contact with each other, and have come up with the present invention.

図７は、本実施形態における電池パックの部分斜視図である。なお、図７では、説明の便宜上、外装板３０、３１、及び、各列の端に配列された電池１を省略している。   FIG. 7 is a partial perspective view of the battery pack in the present embodiment. In FIG. 7, for convenience of explanation, the exterior plates 30 and 31 and the batteries 1 arranged at the end of each row are omitted.

図７に示すように、２列に配列された複数のリブ１２において、各列におけるリブ１２は、互いに隣接するリブ１２の対向する部位から周方向に離れた部位に、リブ１２の側壁の高さが、他の部位よりも低くなった切り欠け部１４を有している。図７に示した例では、各リブ１２の周方向に、４つの切り欠け部１４が設けられている。   As shown in FIG. 7, in the plurality of ribs 12 arranged in two rows, the ribs 12 in each row are located at positions away from the opposing portions of the adjacent ribs 12 in the circumferential direction at the height of the side walls of the ribs 12. However, it has the notch part 14 which became lower than other site | parts. In the example shown in FIG. 7, four notches 14 are provided in the circumferential direction of each rib 12.

このように、各リブ１２に切り欠け部１４を設けることによって、列方向に配列されたリブ１２同士が当接している場合でも、電解液が漏出した電池１が挿入されたリブ１２に電解液が一杯になっても、当接している部位から離れた部位に設けられた切り欠け部１４から、電解液が優先的に溢れるため、隣の電池１が挿入されたリブ１２に電解液が入り込むことを防止することができる。これにより、複数の電池を高密度に配列しても、電解液を介した電池の短絡発生を防止でき、短絡電流による電池の発熱を防止することができる。   Thus, by providing the notch part 14 in each rib 12, even when the ribs 12 arranged in the row direction are in contact with each other, the electrolyte solution is inserted into the rib 12 into which the battery 1 from which the electrolyte solution has leaked is inserted. Even when the battery is full, the electrolyte solution preferentially overflows from the notch 14 provided at the site away from the contacted region, so that the electrolyte solution enters the rib 12 in which the adjacent battery 1 is inserted. This can be prevented. Thereby, even if a plurality of batteries are arranged at high density, it is possible to prevent the battery from being short-circuited via the electrolytic solution and to prevent the battery from being heated due to the short-circuit current.

なお、本実施形態において、列方向に配列されたリブ１２同士は、必ずしも当接している場合に限らない。例えば、リブ１２に溜まった電解液が、表面張力等で、隣接するリブ１２に入り込む程度に離れている場合も、本発明の効果を発揮し得る。   In the present embodiment, the ribs 12 arranged in the row direction are not necessarily in contact with each other. For example, the effect of the present invention can also be exhibited when the electrolyte accumulated in the ribs 12 is so far away as to enter the adjacent ribs 12 due to surface tension or the like.

また、図７では、２列に配列されたリブ１２において、列間で互いに対向するリブ１２を、離間して配列した例を示したが、互いに当接して配列しても、本発明の効果を発揮し得る。この場合、図６（ｃ）に示したように、複数個の直列に接続された電池において、電解液を介した短絡の発生を防止でき、電池パック全体の異常過熱を防止することができる。   FIG. 7 shows an example in which the ribs 12 that are opposed to each other in the rows of the ribs 12 that are arranged in two rows are separated from each other. However, even if they are arranged in contact with each other, the effect of the present invention is achieved. Can be demonstrated. In this case, as shown in FIG. 6C, in a plurality of batteries connected in series, occurrence of a short circuit through the electrolyte can be prevented, and abnormal overheating of the entire battery pack can be prevented.

なお、図７に示したように、リブ１２から溢れた電解液は、ケース１１の周囲の側壁に囲まれた空間１３に溜まるため、空間１３に溜まった電解液が、リブ１２の側壁の高さを超えない限り、電解液を介した電池１の短絡は発生しない。この場合、ケース１１内において、複数のリブ１２で区画された領域以外の空間は、互いに連通していることが好ましい。これにより、一部の空間で電解液が溢れて、隣接するリブ１２に電解液が入り込むのを防止することができる。   As shown in FIG. 7, the electrolyte overflowing from the ribs 12 accumulates in the space 13 surrounded by the side walls around the case 11, so that the electrolyte accumulated in the spaces 13 becomes higher on the side walls of the ribs 12. As long as it does not exceed this value, the short circuit of the battery 1 through the electrolytic solution does not occur. In this case, in the case 11, it is preferable that spaces other than the region partitioned by the plurality of ribs 12 communicate with each other. Thereby, it can prevent that electrolyte solution overflows in a part of space, and electrolyte solution penetrates into the adjacent rib 12.

本実施形態において、ケース１１及び複数のリブ１２は、一体成形されていることが好ましい。これにより、複数のリブ１２に設けられた切り欠け部１４を、リブ１２の配列方向Ａにおいて、予め所定の位置に設定することができる。また、リブ１２の周方向に設ける切り欠け部１４の数や形状は、特に制限されない。   In the present embodiment, it is preferable that the case 11 and the plurality of ribs 12 are integrally formed. Thereby, the notch part 14 provided in the some rib 12 can be previously set to the predetermined position in the arrangement direction A of the rib 12. Further, the number and shape of the cutout portions 14 provided in the circumferential direction of the rib 12 are not particularly limited.

（第２の実施形態）
上述したように、電池１から電解液が漏出することによって、電解液を介した電池の短絡が発生するおそれがあるが、電池１から漏出した電解液が、電池パック１００の外に流出することによって、電解液を介した電池パックの短絡が発生するおそれもある。 (Second Embodiment)
As described above, the leakage of the electrolyte from the battery 1 may cause a short circuit of the battery via the electrolyte, but the electrolyte leaked from the battery 1 flows out of the battery pack 100. As a result, the battery pack may be short-circuited via the electrolytic solution.

図８は、電池１から漏出した電解液が、電池パック１００の外に流出することによって、電解液を介した電池パックの短絡が発生する例を示した図で、図８（ａ）は概念図、図８（ｂ）は、等価回路図である。   FIG. 8 is a diagram showing an example in which a short circuit of the battery pack occurs through the electrolytic solution when the electrolytic solution leaked from the battery 1 flows out of the battery pack 100. FIG. FIG. 8 and FIG. 8B are equivalent circuit diagrams.

図８（ａ）に示すように、電池パック１００は、金属シャーシ２００上に載置されて、例えば、電源装置を構成している。このとき、電池パック１００の負極端子が、金属シャーシ２００に接続されている。この場合、例えば、電池パック１００内の電池１Ａから電解液が電池パック１００外に流出して、金属シャーシ２００上に溜まると、図８（ｂ）に示すように、電池１Ａを含む２個の直列接続された電池において、電解液を介した短絡が発生する。もし、直列接続された複数の電池において、電池パック１００の正極端子に最も近い電池１から漏出した電解液が、電池パック１００外に流出して、金属シャーシ２００上に溜まると、電池パックを構成する電池全体の直列接続された電位差による短絡が発生するため、電池パック全体が異常過熱するおそれがある。   As shown to Fig.8 (a), the battery pack 100 is mounted on the metal chassis 200, and comprises the power supply device, for example. At this time, the negative electrode terminal of the battery pack 100 is connected to the metal chassis 200. In this case, for example, when the electrolyte flows out of the battery pack 100 from the battery 1A in the battery pack 100 and accumulates on the metal chassis 200, as shown in FIG. In batteries connected in series, a short circuit occurs through the electrolyte. If the electrolyte leaked from the battery 1 closest to the positive terminal of the battery pack 100 flows out of the battery pack 100 and accumulates on the metal chassis 200 in a plurality of batteries connected in series, the battery pack is configured. Since the short circuit occurs due to the potential difference of the whole battery connected in series, the whole battery pack may be abnormally overheated.

図９は、電池１から漏出した電解液が、電池パック１００の外に流出することによって、電解液を介した電池パック間の短絡が発生する例を示した図で、図９（ａ）は概念図、図９（ｂ）は、等価回路図である。   FIG. 9 is a diagram illustrating an example in which a short circuit occurs between battery packs via the electrolytic solution when the electrolytic solution leaked from the battery 1 flows out of the battery pack 100. FIG. A conceptual diagram, FIG. 9B, is an equivalent circuit diagram.

図９（ａ）に示すように、複数の直列に接続された電池パック（本例では、２個の電池パック１００Ａ、１００Ｂが直列接続）が、共通の金属シャーシ２００上に載置されて、例えば、電源装置を構成している。この場合、電池パック１００Ａ内の電池１Ａ、及び電池パック１００Ｂ内の電池１Ｂから、電解液がそれぞれ電池パック１００Ａ、１００Ｂ外に流出して、金属シャーシ２００上に溜まると、図９（ｂ）に示すように、２つの電池パック１００Ａ、１００Ｂに跨って直列接続された複数の電池（本例では、５個の直列接続された電池）において、電解液を介した短絡が発生する。このように、多くの電池が直列接続された電位差の大きな短絡が発生するため、電池パック全体が異常過熱するおそれがある。   As shown in FIG. 9 (a), a plurality of battery packs connected in series (in this example, two battery packs 100A and 100B are connected in series) are placed on a common metal chassis 200, For example, a power supply device is configured. In this case, when the electrolyte flows out of the battery packs 100A and 100B from the battery 1A in the battery pack 100A and the battery 1B in the battery pack 100B and accumulates on the metal chassis 200, FIG. As shown, in a plurality of batteries connected in series across the two battery packs 100A and 100B (in this example, five batteries connected in series), a short circuit occurs via the electrolytic solution. Thus, since a short circuit with a large potential difference is generated in which many batteries are connected in series, the entire battery pack may be abnormally overheated.

このような電解液を介した短絡は、電解液が電池パック１００外に流出しないよう、例えば、電池パック１００を密閉状態にすれば回避することもできるが、複数の電池１を冷却することが困難になるという弊害もある。   Such a short circuit through the electrolytic solution can be avoided by, for example, putting the battery pack 100 in a sealed state so that the electrolytic solution does not flow out of the battery pack 100. However, the plurality of batteries 1 can be cooled. There is also the harmful effect of becoming difficult.

そこで、本願発明者等は、複数の電池の冷却効果を維持しつつ、電解液が電池パック外に流出することによる電解液を介した短絡を防止する方法を検討し、その解決方法を見出した。   Therefore, the inventors of the present application have studied a method for preventing a short circuit through the electrolytic solution due to the electrolytic solution flowing out of the battery pack while maintaining the cooling effect of the plurality of batteries, and found a solution to the problem. .

図１０は、本発明の第２の実施形態における電池パックの構成を示した部分斜視図である。なお、本実施形態における電池パックの基本的な構成は、図２及び図３に示した電池パックの構成と同じである。   FIG. 10 is a partial perspective view showing the configuration of the battery pack according to the second embodiment of the present invention. The basic configuration of the battery pack in the present embodiment is the same as the configuration of the battery pack shown in FIGS.

すなわち、図２及び図３に示したように、本実施形態における電池パックは、複数の円筒形の電池１と、電池１を保持する一対の第１のホルダー１０及び第２のホルダー２０を備えている。複数の電池１は、少なくとも１列に配列され、かつ、直列に接続されている。第１のホルダー１０は、一方が開口された有底箱形のケース１１と、ケース１１の内底面に配設された複数の円筒形のリブ１２とを有し、各リブ１２に、各電池１の下部が挿入されている。また、第２のホルダー２０は、ケース１１と幅が略同一の板部材２１と、板部材２１の平面に形成された複数の円筒状の貫通孔２２とを有し、各貫通孔２２に、各電池１の上部が挿入されている。ケース１１及び板部材２１の列方向Ａに平行な両側部に、一対の外装板３０、３１が取り付けられ、外装板３０、３１には、電池１の冷却用の複数の孔３０ａが設けられている。これにより、列方向Ａに配列した複数の電池１は、列方向Ａと垂直な方向から、孔３０ａを通過する空気によって冷却される。   That is, as shown in FIGS. 2 and 3, the battery pack according to this embodiment includes a plurality of cylindrical batteries 1 and a pair of first holder 10 and second holder 20 that hold the batteries 1. ing. The plurality of batteries 1 are arranged in at least one row and connected in series. The first holder 10 includes a bottomed box-shaped case 11 having one open side, and a plurality of cylindrical ribs 12 disposed on the inner bottom surface of the case 11. The lower part of 1 is inserted. The second holder 20 includes a plate member 21 having a width substantially the same as that of the case 11 and a plurality of cylindrical through holes 22 formed in the plane of the plate member 21. The upper part of each battery 1 is inserted. A pair of exterior plates 30, 31 are attached to both sides of the case 11 and the plate member 21 parallel to the row direction A, and the exterior plates 30, 31 are provided with a plurality of holes 30 a for cooling the battery 1. Yes. Thereby, the plurality of batteries 1 arranged in the column direction A are cooled from the direction perpendicular to the column direction A by the air passing through the holes 30a.

図１０に示すように、第２のホルダー２０は、板部材２１の側部において、当該側部の上端部２１ａの位置が、貫通孔２２に挿入された電池１の上端部１ａの位置よりも高くなるような段差を有している。これにより、電池１の安全弁２から漏出した電解液は、板部材２１の側部上端部２１ａを乗り越えることなく、電池１の側面と貫通孔２２との隙間を下降して、電池１の下部が挿入されたリブ１２に溜まることになる。   As shown in FIG. 10, in the second holder 20, in the side portion of the plate member 21, the position of the upper end portion 21 a of the side portion is higher than the position of the upper end portion 1 a of the battery 1 inserted into the through hole 22. There is a step that becomes higher. As a result, the electrolyte leaked from the safety valve 2 of the battery 1 descends the gap between the side surface of the battery 1 and the through hole 22 without getting over the side upper end 21a of the plate member 21, and the lower part of the battery 1 It will accumulate in the inserted rib 12.

もし、板部材２１の側部に、電池１の上端部１ａの位置より高くなった段差がなければ、電池１の安全弁２から漏出した電解液は、板部材２１の側部上端部２１ａを乗り越えて、板部材２１と外装板３０、３１の内側面との隙間に流れ込む。隙間に流れ込んだ電解液の一部は、外装板３０、３１の孔３０ａ、３１ａを通り抜けて、外装板３０、３１の外側面に沿って下降して、電池パック外に流出することになる。その場合、図８（ａ）、図９（ａ）に示したような状態が生じると、電池パック内の複数の電池、あるいは、２つ以上の電池パックに跨る複数の電池において、電解液を介した短絡が発生するおそれがある。   If there is no step at the side of the plate member 21 that is higher than the position of the upper end 1a of the battery 1, the electrolyte leaked from the safety valve 2 of the battery 1 gets over the side upper end 21a of the plate 21. Then, it flows into the gap between the plate member 21 and the inner surfaces of the exterior plates 30 and 31. A part of the electrolyte flowing into the gap passes through the holes 30a and 31a of the exterior plates 30 and 31, descends along the outer surface of the exterior plates 30 and 31, and flows out of the battery pack. In that case, when the state shown in FIGS. 8A and 9A occurs, the electrolyte solution is applied to a plurality of batteries in the battery pack or a plurality of batteries straddling two or more battery packs. There is a risk of short circuiting.

本実施形態における電池パックは、第２のホルダー２０の板部材２１の側部に、電池１の上端部１ａの位置より高くなった段差を設けることによって、電池１の安全弁２から漏出した電解液を、優先的に、電池１の側面と貫通孔２２との隙間を下降させて、電池１の下部が挿入されたリブ１２に溜めることができ、これにより、電解液の電池パック外への流出を防止することができる。   In the battery pack according to the present embodiment, the electrolytic solution leaked from the safety valve 2 of the battery 1 is provided on the side portion of the plate member 21 of the second holder 20 by providing a step that is higher than the position of the upper end portion 1a of the battery 1. Can be preferentially lowered in the gap between the side surface of the battery 1 and the through-hole 22 and stored in the rib 12 in which the lower part of the battery 1 is inserted, so that the electrolyte flows out of the battery pack. Can be prevented.

なお、図１０に示した第２のホルダー２０において、板部材２１の側部から、貫通孔２２の一部を覆うように突出した突出部２３を設けている。この突出部２３は、電池１の上端部１ａを押さえる機能を有し、これにより、電池１を、より安定して、第２のホルダー２０に保持することができる。従って、板部材２１の側部に設ける段差は、突出部２３の厚みを利用して、電池１の上端部１ａと突出部２３との間に設けてもよい。   In addition, in the 2nd holder 20 shown in FIG. 10, the protrusion part 23 which protruded so that a part of through-hole 22 might be covered from the side part of the plate member 21 is provided. The projecting portion 23 has a function of pressing the upper end portion 1 a of the battery 1, whereby the battery 1 can be held in the second holder 20 more stably. Therefore, the step provided on the side portion of the plate member 21 may be provided between the upper end portion 1 a and the protruding portion 23 of the battery 1 using the thickness of the protruding portion 23.

図１１は、本発明の第２の実施形態に電池パックの変形例を示した部分断面図である。   FIG. 11 is a partial cross-sectional view showing a modification of the battery pack in the second embodiment of the present invention.

図１１に示すように、本変形例における電池パックは、貫通孔２２の側部が板部材２１の側部に接近した部位の近傍において、板部材２１の側部と外装板３０との間に、１ｍｍ以上の隙間４０が設けられている。これにより、電池１の安全弁２から漏出した電解液が、板部材２１の側部上端部２１ａを乗り越えて、板部材２１と外装板３０、３１の隙間４０に流れ込んだとしても、隙間４０の間隔が十分に離れているため、電解液は、板部材２１の側部のみを下降し、外装板３０、３１には伝わらない。従って、板部材２１の側部上端部２１ａを乗り越えた電解液を、板部材２１の側部、及び電池１の側面を下降させて、電池１の下部が挿入されたリブ１２に溜めることができ、これにより、電解液の電池パック外への流出を防止することができる。   As shown in FIG. 11, the battery pack according to the present modification is provided between the side portion of the plate member 21 and the exterior plate 30 in the vicinity of the portion where the side portion of the through hole 22 approaches the side portion of the plate member 21. A gap 40 of 1 mm or more is provided. As a result, even if the electrolyte leaked from the safety valve 2 of the battery 1 gets over the side upper end 21a of the plate member 21 and flows into the gap 40 between the plate member 21 and the exterior plates 30 and 31, the interval of the gap 40 Is sufficiently separated, the electrolytic solution descends only on the side portion of the plate member 21 and is not transmitted to the exterior plates 30 and 31. Therefore, the electrolyte over the side upper end portion 21a of the plate member 21 can be accumulated in the rib 12 into which the lower portion of the battery 1 is inserted by lowering the side portion of the plate member 21 and the side surface of the battery 1. Thus, it is possible to prevent the electrolyte from flowing out of the battery pack.

本実施形態において、第１のホルダー１０において、ケース１１の側壁の高さは、リブ１２の側壁の高さよりも高いことが好ましい。これにより、リブ１２から溢れて、ケース１１の周囲の側壁に囲まれた空間１３に溜まった電解液が、ケース１１の側壁を乗り越えて、電池パック外に流出するのを防止することができる。   In the present embodiment, in the first holder 10, the height of the side wall of the case 11 is preferably higher than the height of the side wall of the rib 12. As a result, it is possible to prevent the electrolyte that overflows from the rib 12 and accumulates in the space 13 surrounded by the side wall around the case 11 from getting over the side wall of the case 11 and out of the battery pack.

以上、本発明を好適な実施形態により説明してきたが、こうした記述は限定事項ではなく、もちろん、種々の改変が可能である。   As mentioned above, although this invention was demonstrated by suitable embodiment, such description is not a limitation matter and of course various modifications are possible.

また、本発明は、上記実施形態に示した電池パックを、金属シャーシ上に載置した電源装置にも適用することができる。この場合、電池パックの負極端子は、金属シャーシに接続されている。   The present invention can also be applied to a power supply device in which the battery pack shown in the above embodiment is placed on a metal chassis. In this case, the negative electrode terminal of the battery pack is connected to the metal chassis.

また、本発明は、上記実施形態に示した電池パックを、複数個直列接続して、金属シャーシ上に載置した電源装置にも適用することができる。   The present invention can also be applied to a power supply device in which a plurality of battery packs shown in the above embodiment are connected in series and placed on a metal chassis.

本発明は、例えば、電気自動車等の電源装置に有用である。   The present invention is useful for a power supply device such as an electric vehicle.

１ 電池
２ 安全弁
３ 正極端子
４ 負極端子
５ 電池ケース
６ 封口板
１０ 第１のホルダー
１１ ケース
１２ リブ
１３ 空間
１４ 切り欠け部
２０ 第２のホルダー
２１ 板部材
２２ 貫通孔
２３ 突出部
３０、３１ 外装板
３０ａ、３１ａ 孔
４０ 隙間
１００ 電池パック
２００ 金属シャーシ 1 battery
2 Safety valve
3 Positive terminal
4 Negative terminal
5 Battery case
6 Sealing plate
10 First holder
11 cases
12 Ribs
13 space
14 Notch
20 Second holder
21 Plate member
22 Through hole
23 Protrusion
30, 31 Exterior plate
30a, 31a hole
40 gap
100 battery pack
200 metal chassis

Claims (12)

複数の円筒形の電池と、該電池を保持するホルダーとを備えた電池パックであって、
前記ホルダーは、一方が開口された有底箱形のケースと、該ケースの内底面に配設された複数の円筒形のリブとを有し、
前記複数のリブは、少なくとも１列に配列されており、
前記複数の電池は、該電池の下部が、それぞれ前記各リブに挿入され、かつ、直列接続された電池を少なくとも複数個含み、
前記各リブは、互いに隣接するリブの対向する部位から周方向に離れた部位に、前記リブの側壁の高さが、他の部位よりも低くなった切り欠け部を有している、電池パック。 A battery pack comprising a plurality of cylindrical batteries and a holder for holding the batteries,
The holder has a bottomed box-shaped case in which one side is opened, and a plurality of cylindrical ribs disposed on the inner bottom surface of the case,
The plurality of ribs are arranged in at least one row,
The plurality of batteries include at least a plurality of batteries in which lower portions of the batteries are respectively inserted into the ribs and connected in series.
Each of the ribs has a notch in which the height of the side wall of the rib is lower than that of the other part at a part away from the opposing part of the adjacent ribs in the circumferential direction. . 列方向に配列された前記リブは、互いに当接している、請求項１に記載の電池パック。   The battery pack according to claim 1, wherein the ribs arranged in the row direction are in contact with each other. 前記複数のリブは、２列に配列されており、列間で互いに対向するリブは、離間して配列されている、請求項１または２に記載の電池パック。   The battery pack according to claim 1 or 2, wherein the plurality of ribs are arranged in two rows, and the ribs facing each other between the rows are arranged apart from each other. 前記ケース内において、前記複数のリブで区画された領域以外の空間は、互いに連通している、請求項１に記載の電池パック。   The battery pack according to claim 1, wherein spaces in the case other than the region partitioned by the plurality of ribs communicate with each other. 前記ケースの側壁の高さは、前記リブの側壁の高さよりも高い、請求項１に記載の電池パック。   The battery pack according to claim 1, wherein a height of a side wall of the case is higher than a height of a side wall of the rib. 前記ケース及び前記複数のリブは、一体成形されている、請求項１に記載の電池パック。   The battery pack according to claim 1, wherein the case and the plurality of ribs are integrally formed. 複数の円筒形の電池と、該電池を保持するホルダーとを備えた電池パックであって、
前記ホルダーは、一対の第１のホルダーと第２のホルダーとを備え、
前記複数の電池は、少なくとも１列に配列され、かつ、直列接続された電池を少なくとも複数個含み、
前記第１のホルダーは、
一方が開口された有底箱形のケースと、該ケースの内底面に配設された複数の円筒形のリブとを有し、
前記各リブに、前記各電池の下部が挿入されており、
前記第２のホルダーは、
前記ケースと幅が略同一の板部材と、該板部材の平面に形成された複数の円筒状の貫通孔とを有し、
前記各貫通孔に、前記各電池の上部が挿入されており、
前記ケース及び前記板部材の列方向に平行な両側部に、一対の外装板が取り付けられ、該外装板には、前記電池の冷却用の複数の孔が設けられており、
少なくも前記貫通孔の側部が前記板部材の側部に接近した部位の近傍において、前記板部材の側部と前記外装板との間に、１ｍｍ以上の隙間が設けられている、電池パック。 A battery pack comprising a plurality of cylindrical batteries and a holder for holding the batteries,
The holder includes a pair of a first holder and a second holder,
The plurality of batteries include at least a plurality of batteries arranged in at least one row and connected in series,
The first holder is
A bottomed box-shaped case with one open, and a plurality of cylindrical ribs disposed on the inner bottom surface of the case;
The lower part of each battery is inserted in each rib,
The second holder is
A plate member having substantially the same width as the case, and a plurality of cylindrical through holes formed in a plane of the plate member;
The upper part of each battery is inserted into each through hole,
A pair of exterior plates are attached to both sides parallel to the row direction of the case and the plate member, and the exterior plates are provided with a plurality of holes for cooling the battery,
A battery pack in which a gap of 1 mm or more is provided between the side portion of the plate member and the exterior plate in the vicinity of a portion where the side portion of the through hole is close to the side portion of the plate member. . 前記第２のホルダーは、前記板部材の側部において、該側部の上端部の位置が、前記貫通孔に挿入された前記電池の上端部の位置よりも高くなるような段差を有している、請求項７に記載の電池パック。   The second holder has a step in the side portion of the plate member such that the position of the upper end portion of the side portion is higher than the position of the upper end portion of the battery inserted into the through hole. The battery pack according to claim 7. 前記ケースの側壁の高さは、前記リブの側壁の高さよりも高い、請求項７または８に記載の電池パック。   The battery pack according to claim 7 or 8, wherein the height of the side wall of the case is higher than the height of the side wall of the rib. 前記ケース及び前記複数のリブは、一体成形されている、請求項７に記載の電池パック。   The battery pack according to claim 7, wherein the case and the plurality of ribs are integrally formed. 請求項７〜１０の何れか１項に記載の電池パックを備えた電源装置であって、
前記電池パックは、金属シャーシ上に載置され、かつ、前記電池パックの負極端子が、前記金属シャーシに接続されている、電源装置。 A power supply device comprising the battery pack according to any one of claims 7 to 10,
The battery pack is mounted on a metal chassis, and a negative electrode terminal of the battery pack is connected to the metal chassis. 請求項７〜１０の何れか１項に記載の電池パックを複数個備えた電源装置であって、
前記複数の電池パックは、直列接続され電池パックが少なくとも複数個含み、かつ、金属シャーシ上に載置されている、電源装置。 A power supply device comprising a plurality of the battery packs according to any one of claims 7 to 10,
The plurality of battery packs are connected in series, include at least a plurality of battery packs, and are placed on a metal chassis.
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