JP7006051B2 - Battery pack, conductive and protective members - Google Patents

Battery pack, conductive and protective members Download PDF

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JP7006051B2
JP7006051B2 JP2017173377A JP2017173377A JP7006051B2 JP 7006051 B2 JP7006051 B2 JP 7006051B2 JP 2017173377 A JP2017173377 A JP 2017173377A JP 2017173377 A JP2017173377 A JP 2017173377A JP 7006051 B2 JP7006051 B2 JP 7006051B2
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threshold value
battery
conductive member
insulator
pack
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JP2019050109A (en
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尚美 長田
昌之 中井
志保 井上
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Nissan Motor 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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Description

本発明は、電池パック、電池パックに用いられる導電部材および導電部材を保護する保護部材に関する。 The present invention relates to a battery pack, a conductive member used in the battery pack, and a protective member for protecting the conductive member.

導電部材を介して複数の電池モジュールを電気的に接続した組電池と、組電池を収容する金属製のパックケースと、を有する電池パックが知られている（特許文献１参照）。組電池は、導電部材を覆って配置され、導電部材を保護する保護部材を有する。 A battery pack having an assembled battery in which a plurality of battery modules are electrically connected via a conductive member and a metal pack case for accommodating the assembled battery is known (see Patent Document 1). The assembled battery is arranged so as to cover the conductive member and has a protective member that protects the conductive member.

特開２０１５－５３６１号公報Japanese Unexamined Patent Publication No. 2015-5361

電池モジュールは、内部短絡等によって異常発熱する可能性がある。上記電池パックにおいて、保護部材は、電池モジュールの異常時に発生する熱によって加熱されると溶融する虞がある。保護部材が溶融すると、導電部材とパックケースとが接触するなどして、導電部材とパックケースとの間に短絡が生じ、電池パック内部に短絡経路が形成される虞がある。短絡経路が形成されると、短絡経路を介して電池パック内部に過大な電流が流れ、電池パック全体がさらに高温になり、初めに異常発熱が生じた電池モジュール以外の電池モジュールまでも損傷する虞がある。 The battery module may generate abnormal heat due to an internal short circuit or the like. In the battery pack, the protective member may melt when heated by the heat generated when the battery module is abnormal. When the protective member melts, a short circuit may occur between the conductive member and the pack case due to contact between the conductive member and the pack case, and a short circuit path may be formed inside the battery pack. When a short-circuit path is formed, an excessive current flows inside the battery pack through the short-circuit path, the entire battery pack becomes even hotter, and there is a risk that the battery modules other than the battery module that initially generated abnormal heat generation will be damaged. There is.

本発明の目的は、電池モジュールに異常発熱が生じた場合であっても、電池パック内部に過大な電流が流れることを防止できる電池パックを提供することである。 An object of the present invention is to provide a battery pack capable of preventing an excessive current from flowing inside the battery pack even when abnormal heat generation occurs in the battery module.

上記目的を達成するための本発明の電池パックは、複数の電池モジュールを電気的に接続する導電部材を覆って配置され、前記導電部材を電気的に保護する保護部材を有し、前記保護部材は、前記電池モジュールの異常発熱によって前記保護部材の温度が閾値を超えるまで絶縁抵抗を有し、前記閾値よりも高い温度において、前記絶縁抵抗よりも小さく、かつ、前記パックケースよりも大きな電気抵抗を有する。前記保護部材は、前記閾値を超えるまで前記絶縁抵抗を有するとともに、前記閾値よりも高い温度において溶融する絶縁体と、溶融温度が前記閾値よりも高く、かつ、前記パックケースよりも大きな電気抵抗を有する高抵抗導体と、を有する。
ここで、本発明の電池パックの一様相では、前記絶縁体および前記高抵抗導体は、層をなした状態で前記導電部材を覆っている。
また、本発明の電池パックの別の様相では、前記高抵抗導体は、前記絶縁体が前記閾値を超える温度になるまで、前記絶縁体の内部に分散した状態で含まれている。 The battery pack of the present invention for achieving the above object is arranged so as to cover a conductive member that electrically connects a plurality of battery modules, and has a protective member that electrically protects the conductive member, and the protective member. Has an insulating resistance until the temperature of the protective member exceeds the threshold due to abnormal heat generation of the battery module, and at a temperature higher than the threshold, an electric resistance smaller than the insulating resistance and larger than the pack case. Have. The protective member has the insulating resistance until it exceeds the threshold value, and has an insulator that melts at a temperature higher than the threshold value and an electric resistance having a melting temperature higher than the threshold value and larger than the pack case. It has a high resistance conductor and has.
Here, in the uniform phase of the battery pack of the present invention, the insulator and the high resistance conductor cover the conductive member in a layered state.
Further, in another aspect of the battery pack of the present invention, the high resistance conductor is contained in a dispersed state inside the insulator until the temperature of the insulator exceeds the threshold value.

第１実施形態に係る電池パックを示す斜視図である。It is a perspective view which shows the battery pack which concerns on 1st Embodiment. 第１実施形態に係る電池パックを示す平面図である。It is a top view which shows the battery pack which concerns on 1st Embodiment. 第１実施形態に係る電池パックを示す正面図である。It is a front view which shows the battery pack which concerns on 1st Embodiment. 第１実施形態に係る電池パックのアッパーケースを示す斜視図である。It is a perspective view which shows the upper case of the battery pack which concerns on 1st Embodiment. 第１実施形態に係る電池パックのロアケースを示す斜視図である。It is a perspective view which shows the lower case of the battery pack which concerns on 1st Embodiment. 第１実施形態に係る電池モジュールを示す斜視図である。It is a perspective view which shows the battery module which concerns on 1st Embodiment. 第１実施形態に係る電池モジュールを分解して示す斜視図である。It is a perspective view which shows disassembled the battery module which concerns on 1st Embodiment. 第１実施形態に係る電池モジュールの積層体を分解して示す斜視図である。It is a perspective view which shows the laminated body of the battery module which concerns on 1st Embodiment by disassembling. 第１実施形態に係る電池モジュールの積層体カバーおよび入出力用部材を示す斜視図である。It is a perspective view which shows the laminated body cover and the input / output member of the battery module which concerns on 1st Embodiment. 第１実施形態に係る電池モジュールの単電池を示す斜視図である。It is a perspective view which shows the cell cell of the battery module which concerns on 1st Embodiment. 第１実施形態に係るバスバを示す斜視図である。It is a perspective view which shows the bus bar which concerns on 1st Embodiment. 第１実施形態に係るバスバの長手方向に沿う断面図である。It is sectional drawing which follows the longitudinal direction of the bus bar which concerns on 1st Embodiment. 第１実施形態に係るバスバの短手方向に沿う断面図である。It is sectional drawing which follows the short side direction of the bus bar which concerns on 1st Embodiment. 第１実施形態に係る電池モジュール、バスバおよびアッパーケースの部分断面図である。It is a partial cross-sectional view of the battery module, the bus bar and the upper case which concerns on 1st Embodiment. 第１実施形態に係る電池モジュール、バスバおよびアッパーケースの部分断面図であって、電池モジュールが異常発熱した際の断面図である。It is a partial cross-sectional view of the battery module, the bus bar and the upper case which concerns on 1st Embodiment, and is the cross-sectional view at the time of abnormal heat generation of a battery module. 第１実施形態に係る電池パックの動作を説明するための図であって、バスバとモジュールケースとの間に短絡が生じる様子を示す斜視図である。It is a figure for demonstrating the operation of the battery pack which concerns on 1st Embodiment, and is the perspective view which shows the state which the short circuit occurs between a bus bar and a module case. 第１実施形態に係る電池パックの動作を説明するための図であって、電池パックの内部に短絡経路が形成される様子を示す電池パックの平面図である。It is a figure for demonstrating the operation of the battery pack which concerns on 1st Embodiment, and is the top view of the battery pack which shows the state which the short circuit path is formed inside the battery pack. 第１実施形態の変形例に係る電池モジュールとバスバの部分断面図である。It is a partial cross-sectional view of the battery module and the bus bar which concerns on the modification of 1st Embodiment. 第１実施形態の変形例に係る電池モジュールとバスバの部分断面図であって、電池モジュールが異常発熱した際の断面図である。It is a partial sectional view of the battery module and the bus bar which concerns on the modification of 1st Embodiment, and is the sectional view when the battery module abnormally generates heat. 第２実施形態に係る電池モジュールとバスバの部分断面図である。It is a partial cross-sectional view of the battery module and the bus bar which concerns on 2nd Embodiment. 第２実施形態に係る電池モジュールとバスバの部分断面図であって、電池モジュールが異常発熱した際の断面図である。It is a partial cross-sectional view of the battery module and the bus bar which concerns on 2nd Embodiment, and is the cross-sectional view at the time of abnormal heat generation of a battery module. 改変例に係る電池パックの入出力用部材を示す斜視図である。It is a perspective view which shows the input / output member of the battery pack which concerns on the modification example. 改変例に係る電池パックの入出力用部材の短手方向に沿う断面図である。It is sectional drawing which follows the short side direction of the input / output member of the battery pack which concerns on the modification.

以下、添付した図面を参照しながら、本発明の実施形態を説明する。図面において、同一の部材には同一の符号を付し、重複する説明を省略する。図面において、各部材の大きさや比率は、実施形態の理解を容易にするために誇張し、実際の大きさや比率とは異なる場合がある。 Hereinafter, embodiments of the present invention will be described with reference to the attached drawings. In the drawings, the same members are designated by the same reference numerals, and duplicate description will be omitted. In the drawings, the size and ratio of each member may be exaggerated to facilitate understanding of the embodiment and may differ from the actual size and ratio.

（第１実施形態）
図中において、Ｘ、Ｙ、およびＺで表す矢印を用いて、方位を示している。Ｘによって表す矢印の方向は、単電池１３１の積層方向と交差し、かつ、単電池１３１の長手方向に沿った方向を示している。Ｙによって表す矢印の方向は、単電池１３１の積層方向と交差し、かつ、単電池１３１の短手方向に沿った方向を示している。Ｚによって表す矢印の方向は、単電池１３１の積層方向を示している。 (First Embodiment)
In the figure, the directions are indicated by the arrows represented by X, Y, and Z. The direction of the arrow represented by X intersects the stacking direction of the cell 131 and indicates the direction along the longitudinal direction of the cell 131. The direction of the arrow represented by Y intersects the stacking direction of the cell 131 and indicates the direction along the lateral direction of the cell 131. The direction of the arrow represented by Z indicates the stacking direction of the cell 131.

＜電池パック＞
図１Ａ～図１Ｃに示すように、電池パック１は、組電池１０と、パックケース２０と、を有する。 <Battery pack>
As shown in FIGS. 1A to 1C, the battery pack 1 includes an assembled battery 10 and a pack case 20.

組電池１０は、電池モジュール１００を電気的に接続するバスバ１１０（導電部材に相当）を有する。バスバ１１０は、保護カバー１２０によって覆われている。 The assembled battery 10 has a bus bar 110 (corresponding to a conductive member) for electrically connecting the battery module 100. The bus bar 110 is covered by a protective cover 120.

図１Ａ、図２Ａおよび図２Ｂに示すように、パックケース２０は、組電池１０を収容する。パックケース２０は、組電池１０を積層方向Ｚの上側から覆うアッパーケース２１と、組電池１０を積層方向Ｚの下側から覆うロアケース２２と、を有する。ロアケース２２は、電池モジュール１００を固定するための固定用梁２３を有する。 As shown in FIGS. 1A, 2A and 2B, the pack case 20 houses the assembled battery 10. The pack case 20 has an upper case 21 that covers the assembled battery 10 from the upper side in the stacking direction Z, and a lower case 22 that covers the assembled battery 10 from the lower side in the stacking direction Z. The lower case 22 has a fixing beam 23 for fixing the battery module 100.

＜電池モジュール＞
図３Ａおよび図３Ｂに示すように、電池モジュール１００は、積層体１３０と、モジュールケース１４０と、入出力用部材１５０（導電部材に相当）と、固定部１６０と、を有する。 <Battery module>
As shown in FIGS. 3A and 3B, the battery module 100 includes a laminate 130, a module case 140, an input / output member 150 (corresponding to a conductive member), and a fixing portion 160.

積層体１３０は、複数の単電池１３１を積層して構成され、一つの二次電池として機能する。 The laminated body 130 is configured by laminating a plurality of cell cells 131, and functions as one secondary battery.

モジュールケース１４０は、積層体１３０を覆っている。モジュールケース１４０は、積層体１３０の上部を覆う上板１４１と、積層体１３０の下部を覆う下板１４２と、積層体１３０の側面を覆う側板１４３と、を有する。 The module case 140 covers the laminated body 130. The module case 140 has an upper plate 141 that covers the upper part of the laminated body 130, a lower plate 142 that covers the lower part of the laminated body 130, and a side plate 143 that covers the side surface of the laminated body 130.

入出力用部材１５０は、電池モジュール１００から電力を入出力する。電池モジュール１００は、入出力用部材１５０を介して、バスバ１１０に電気的に接続される。入出力用部材１５０は、積層方向Ｚに沿って延びている。 The input / output member 150 inputs / outputs electric power from the battery module 100. The battery module 100 is electrically connected to the bus bar 110 via the input / output member 150. The input / output member 150 extends along the stacking direction Z.

固定部１６０は、電池モジュール１００をパックケース２０に固定する。固定部１６０は、ボルトＢＴを介して、ロアケース２２の固定用梁２３に固定される。 The fixing portion 160 fixes the battery module 100 to the pack case 20. The fixing portion 160 is fixed to the fixing beam 23 of the lower case 22 via the bolt BT.

図４Ａ～図４Ｃに示すように、積層体１３０は、積層された複数の単電池１３１と、積層された単電池１３１を電気的に接続する接続部材１３２と、接続部材１３２を保護する積層体カバー１３３と、を有する。 As shown in FIGS. 4A to 4C, the laminated body 130 is a laminated body that protects a plurality of stacked single batteries 131, a connecting member 132 that electrically connects the laminated single batteries 131, and the connecting member 132. It has a cover 133 and.

単電池１３１は、二次電池、具体的には非水電解質二次電池、さらに具体的にはリチウムイオン二次電池である。単電池１３１は、正極側の電極タブ１３１Ｔｐと、負極側の電極タブ１３１Ｔｎと、を有する。 The cell 131 is a secondary battery, specifically a non-aqueous electrolyte secondary battery, and more specifically, a lithium ion secondary battery. The cell unit 131 has an electrode tab 131Tp on the positive electrode side and an electrode tab 131Tn on the negative electrode side.

接続部材１３２は、積層された複数の単電池１３１を直列および／または並列に接続することによって、積層体１３０の内部に電気回路を構成する。接続部材１３２は、単電池１３１の電極タブ１３１Ｔｐ、１３１Ｔｎに接合される。積層体１３０は、接続部材１３２を介して、積層された単電池１３１が電気的に接続されることによって、一つの二次電池として機能する。 The connecting member 132 constitutes an electric circuit inside the laminated body 130 by connecting a plurality of stacked single batteries 131 in series and / or in parallel. The connecting member 132 is joined to the electrode tabs 131Tp and 131Tn of the cell 131. The laminated body 130 functions as one secondary battery by electrically connecting the laminated single batteries 131 via the connecting member 132.

積層体カバー１３３は、接続部材１３２を覆って配置されている。積層体カバー１３３は、樹脂材料によって構成されている。 The laminated body cover 133 is arranged so as to cover the connecting member 132. The laminated body cover 133 is made of a resin material.

接続部材１３２は、積層された複数の単電池１３１によって構成される電気回路の端子をなすターミナル部材１３２Ｔを有する。ターミナル部材１３２Ｔは、正極側のターミナル部材１３２Ｔｐと、負極側のターミナル部材１３２Ｔｎと、を有する。正極側のターミナル部材１３２Ｔｐは、積層体１３０の上部側に配置される。負極側のターミナル部材１３２Ｔｎは、積層体１３０の下部側に配置される。 The connecting member 132 has a terminal member 132T that forms a terminal of an electric circuit composed of a plurality of stacked cell cells 131. The terminal member 132T has a terminal member 132Tp on the positive electrode side and a terminal member 132Tn on the negative electrode side. The terminal member 132Tp on the positive electrode side is arranged on the upper side of the laminated body 130. The terminal member 132Tn on the negative electrode side is arranged on the lower side of the laminated body 130.

入出力用部材１５０は、ターミナル部材１３２Ｔに電気的に接続される。入出力用部材１５０は、正極側のターミナル部材１３２Ｔｐに接続される正極側の入出力用部材１５１と、負極側のターミナル部材１３２Ｔｎに接続される負極側の入出力用部材１５２と、を有する。 The input / output member 150 is electrically connected to the terminal member 132T. The input / output member 150 includes an input / output member 151 on the positive electrode side connected to the terminal member 132Tp on the positive electrode side, and an input / output member 152 on the negative electrode side connected to the terminal member 132Tn on the negative electrode side.

＜バスバ＞
図３Ａに示すように、バスバ１１０は、入出力用部材１５０に接続される接続部１１０ａを有する。バスバ１１０は、接続部１１０ａにおいて、ボルトＢＴを介して、入出力用部材１５０に固定される。 <Busba>
As shown in FIG. 3A, the bus bar 110 has a connecting portion 110a connected to the input / output member 150. The bus bar 110 is fixed to the input / output member 150 at the connection portion 110a via the bolt BT.

＜保護カバー＞
図５Ａ～図５Ｃに示すように、保護カバー１２０は、バスバ１１０を電気的に保護する。保護カバー１２０は、電池モジュール１００の異常発熱によって保護カバー１２０の温度が閾値を超えるまで絶縁抵抗を有し、閾値よりも高い温度において、パックケース２０よりも大きな電気抵抗を有する。 <Protective cover>
As shown in FIGS. 5A-5C, the protective cover 120 electrically protects the bus bar 110. The protective cover 120 has an insulating resistance until the temperature of the protective cover 120 exceeds the threshold value due to the abnormal heat generation of the battery module 100, and has a larger electric resistance than the pack case 20 at a temperature higher than the threshold value.

「異常発熱」とは、電池モジュール１００の温度が設計値よりも高い温度にまで発熱することを意味する。電池モジュール１００は、外部から電池モジュール１００に異物が貫通した場合や、単電池１３１の内部短絡等によって異常発熱し得る。「閾値」は、予め設計的に設定した任意の温度であり約２００℃程度以上である。異常発熱が生じていない状態での電池モジュール１００の温度は、予め設計的に設定した任意の温度であり約－３０～８０℃程度である。 "Abnormal heat generation" means that the temperature of the battery module 100 heats up to a temperature higher than the design value. The battery module 100 may generate abnormal heat due to a foreign substance penetrating the battery module 100 from the outside, an internal short circuit of the cell 131, or the like. The "threshold value" is an arbitrary temperature set in advance by design and is about 200 ° C. or higher. The temperature of the battery module 100 in a state where abnormal heat generation does not occur is an arbitrary temperature set in advance by design and is about −30 to 80 ° C.

「絶縁抵抗」とは、１０６Ω以上のオーダーの電気抵抗を意味する。 “Insulation resistance” means electrical resistance on the order of 106 Ω or more.

保護カバー１２０は、上記閾値を超えるまで絶縁抵抗を有するとともに、上記閾値よりも高い温度において溶融する絶縁体１２１と、溶融温度が閾値よりも高く、かつ、パックケース２０よりも大きな電気抵抗を有する高抵抗導体１２２と、を有する。高抵抗導体１２２は、絶縁抵抗よりも小さい電気抵抗を有する。 The protective cover 120 has an insulating resistance until it exceeds the threshold value, and has an insulator 121 that melts at a temperature higher than the threshold value, and an electric resistance having a melting temperature higher than the threshold value and larger than that of the pack case 20. It has a high resistance conductor 122 and. The high resistance conductor 122 has an electrical resistance smaller than the insulating resistance.

絶縁体１２１および高抵抗導体１２２は、層をなした状態でバスバ１１０を覆っている。絶縁体１２１および高抵抗導体１２２は、バスバ１１０の厚み方向（図５Ｂにおいて符号Ｚで示す方向）に層をなすとともに、バスバ１１０の厚み方向に交差する方向（図５Ｂにおいて符号Ｘで示す方向）に層をなしている。 The insulator 121 and the high resistance conductor 122 cover the bus bar 110 in a layered state. The insulator 121 and the high resistance conductor 122 form a layer in the thickness direction of the bus bar 110 (direction indicated by reference numeral Z in FIG. 5B) and intersect in the thickness direction of the bus bar 110 (direction indicated by reference numeral X in FIG. 5B). Layered in.

高抵抗導体１２２は、１０－６～１０－５Ω程度のオーダーの電気抵抗を備える。パックケース２０は、１０－８～１０－７Ω程度のオーダーの電気抵抗を備える。 The high resistance conductor 122 has an electric resistance on the order of 10-6 to 10-5 Ω. The pack case 20 has an electric resistance on the order of 10-8 to 10-7 Ω.

絶縁体１２１を構成する材料は、１０６Ωｍ程度以上の電気抵抗率を備えた材料である。絶縁体１２１を構成する材料は、ポリプロピレンやポリエチレン等の樹脂材料である。絶縁体１２１の厚みは、絶縁体１２１が絶縁抵抗（１０６Ω以上のオーダーの電気抵抗）を備えるように調整される。 The material constituting the insulator 121 is a material having an electrical resistivity of about 106 Ωm or more. The material constituting the insulator 121 is a resin material such as polypropylene or polyethylene. The thickness of the insulator 121 is adjusted so that the insulator 121 has an insulating resistance (electrical resistance on the order of 106 Ω or more).

高抵抗導体１２２を構成する材料は、１０－６～１０－５Ωｍ程度の電気抵抗率を備えた材料である。高抵抗導体１２２を構成する材料は、ニクロムまたは炭素である。高抵抗導体１２２の厚みは、高抵抗導体１２２が１０－６～１０－５Ω程度の電気抵抗率を備えるように調整される。 The material constituting the high resistance conductor 122 is a material having an electrical resistivity of about 10-6 to 10-5 Ωm. The material constituting the high resistance conductor 122 is nichrome or carbon. The thickness of the high resistance conductor 122 is adjusted so that the high resistance conductor 122 has an electrical resistivity of about 10-6 to 10-5 Ω.

パックケース２０およびモジュールケース１４０を構成する材料は、導電性の材料である。導電性の材料とは、１０－８～１０－７Ω程度のオーダーの電気抵抗率を備えた材料を意味する。パックケース２０およびモジュールケース１４０を構成する材料は、鉄、アルミニウム、ステンレス鋼等の金属材料である。 The material constituting the pack case 20 and the module case 140 is a conductive material. The conductive material means a material having an electrical resistivity on the order of 10-8 to 10-7 Ω. The materials constituting the pack case 20 and the module case 140 are metal materials such as iron, aluminum, and stainless steel.

図６Ａおよび図６Ｂに示すように、保護カバー１２０は、アッパーケース２１とバスバ１１０との間、および、モジュールケース１４０とバスバ１１０との間に配置されている。 As shown in FIGS. 6A and 6B, the protective cover 120 is arranged between the upper case 21 and the bus bar 110, and between the module case 140 and the bus bar 110.

＜電池パックの動作＞
電池パック１において、一の電池モジュール１００に異常発熱が生じると、当該電池モジュール１００近傍に配置されているバスバ１１０の保護カバー１２０が加熱される。加熱された保護カバー１２０の温度が上記閾値を超えると、絶縁体１２１が溶融する（図６Ｂ参照）。 <Battery pack operation>
When abnormal heat generation occurs in one battery module 100 in the battery pack 1, the protective cover 120 of the bus bar 110 arranged in the vicinity of the battery module 100 is heated. When the temperature of the heated protective cover 120 exceeds the above threshold value, the insulator 121 melts (see FIG. 6B).

絶縁体１２１が溶融した状態においてバスバ１１０とモジュールケース１４０とが接触すると、図７Ａに示すように、バスバ１１０とモジュールケース１４０との間において短絡が生じる可能性がある。図７Ｂに示すように、バスバ１１０とモジュールケース１４０との間の短絡が２箇所（短絡箇所を符号ＳＰで示している）において生じると、パックケース２０を介して、電池パック１内部に短絡経路Ｒが形成される。なお、短絡経路Ｒは、バスバ１１０とパックケース２０とが直接的に接触することによっても生じ得る。 If the bus bar 110 and the module case 140 come into contact with each other in a state where the insulator 121 is melted, a short circuit may occur between the bus bar 110 and the module case 140 as shown in FIG. 7A. As shown in FIG. 7B, when a short circuit occurs between the bus bar 110 and the module case 140 at two points (the short-circuited points are indicated by the reference numerals SP), a short-circuit path is formed inside the battery pack 1 via the pack case 20. R is formed. The short-circuit path R can also be generated by the direct contact between the bus bar 110 and the pack case 20.

保護カバー１２０が高抵抗導体１２２を有していない場合、短絡経路Ｒが形成されると、短絡経路Ｒを介して電池パック１の内部に過大な電流が流れる。その結果、電池パック１全体がさらに高温になって、初めに異常発熱が生じた電池モジュール１００以外の電池モジュール１００までも損傷する虞がある。 When the protective cover 120 does not have the high resistance conductor 122, when the short-circuit path R is formed, an excessive current flows inside the battery pack 1 through the short-circuit path R. As a result, the entire battery pack 1 becomes even hotter, and there is a risk that even the battery modules 100 other than the battery module 100 that initially generated abnormal heat generation will be damaged.

本実施形態に係る電池パック１によれば、保護カバー１２０が高抵抗導体１２２を有する。これにより、絶縁体１２１が溶融しても、保護カバー１２０が高抵抗導体１２２を有していない場合と比較して、短絡経路Ｒに流れる電流値は小さくなる。そのため、電池パック１の内部に過大な電流が流れることを防止できる。 According to the battery pack 1 according to the present embodiment, the protective cover 120 has a high resistance conductor 122. As a result, even if the insulator 121 is melted, the current value flowing in the short-circuit path R becomes smaller than in the case where the protective cover 120 does not have the high resistance conductor 122. Therefore, it is possible to prevent an excessive current from flowing inside the battery pack 1.

さらに、高抵抗導体１２２を介して、短絡経路Ｒに小さな電流値で電流が流れることによって、異常が生じた電池モジュール１００内部のエネルギーを放電によって徐々に放出できる。その結果、異常が生じた電池モジュール１００の温度を下げることができる。 Further, the energy inside the battery module 100 in which the abnormality has occurred can be gradually released by electric discharge by the current flowing through the short-circuit path R with a small current value through the high resistance conductor 122. As a result, the temperature of the battery module 100 in which the abnormality has occurred can be lowered.

（作用・効果）
本実施形態に係る電池パック１は、複数の電池モジュール１００をバスバ１１０によって電気的に接続した組電池１０と、組電池１０を収容する金属製のパックケース２０と、を有する。組電池１０は、バスバ１１０を覆って配置され、バスバ１１０を電気的に保護する保護カバー１２０を有する。保護カバー１２０は、電池モジュール１００の異常発熱によって保護カバー１２０の温度が閾値を超えるまで絶縁抵抗を有し、閾値よりも高い温度において、絶縁抵抗よりも小さく、かつ、パックケース２０よりも大きな電気抵抗を有する。 (Action / effect)
The battery pack 1 according to the present embodiment has an assembled battery 10 in which a plurality of battery modules 100 are electrically connected by a bus bar 110, and a metal pack case 20 for accommodating the assembled battery 10. The assembled battery 10 is arranged so as to cover the bus bar 110, and has a protective cover 120 that electrically protects the bus bar 110. The protective cover 120 has an insulating resistance until the temperature of the protective cover 120 exceeds the threshold value due to abnormal heat generation of the battery module 100, and at a temperature higher than the threshold value, the electricity is smaller than the insulating resistance and larger than the pack case 20. Have resistance.

本実施形態に係る電池パック１によれば、保護カバー１２０は、閾値よりも高い温度において、絶縁抵抗よりも小さく、かつ、パックケース２０の電気抵抗よりも大きな電気抵抗を有する。これにより、電池パック１によれば、電池モジュール１００の異常発熱時に電池パック１の内部に形成される短絡経路Ｒに流れる電流値は小さくなる。従って、電池パック１によれば、電池モジュール１００に異常発熱が生じた場合であっても、電池パック１の内部に過大な電流が流れることを防止できる。 According to the battery pack 1 according to the present embodiment, the protective cover 120 has an electric resistance smaller than the insulation resistance and larger than the electric resistance of the pack case 20 at a temperature higher than the threshold value. As a result, according to the battery pack 1, the current value flowing in the short-circuit path R formed inside the battery pack 1 becomes small when the battery module 100 abnormally generates heat. Therefore, according to the battery pack 1, even when abnormal heat generation occurs in the battery module 100, it is possible to prevent an excessive current from flowing inside the battery pack 1.

また、本実施形態に係る電池パック１において、保護カバー１２０は、閾値を超えるまで絶縁抵抗を有するとともに、閾値よりも高い温度において溶融する絶縁体１２１と、絶縁抵抗よりも小さく、かつ、パックケース２０よりも大きな電気抵抗を有する高抵抗導体１２２と、を有する。そして、絶縁体１２１および高抵抗導体１２２は、層をなした状態でバスバ１１０を覆っている。 Further, in the battery pack 1 according to the present embodiment, the protective cover 120 has an insulating resistance until it exceeds a threshold value, and has an insulator 121 that melts at a temperature higher than the threshold value, and a pack case that is smaller than the insulating resistance and has an insulating resistance. It has a high resistance conductor 122 having an electrical resistance greater than 20. The insulator 121 and the high resistance conductor 122 cover the bus bar 110 in a layered state.

本実施形態に係る電池パック１によれば、絶縁体１２１および高抵抗導体１２２が層をなした状態でバスバ１１０を覆うという簡便な方法によって、保護カバー１２０を形成できる。そのため、本実施形態に係る電池パック１によれば、電池パック１の製造が容易になる。 According to the battery pack 1 according to the present embodiment, the protective cover 120 can be formed by a simple method of covering the bus bar 110 with the insulator 121 and the high resistance conductor 122 in a layered state. Therefore, according to the battery pack 1 according to the present embodiment, the battery pack 1 can be easily manufactured.

（変形例）
上述した実施形態では、絶縁体１２１および高抵抗導体１２２は、層をなした状態でバスバ１１０を覆っていた。しかしながら、図８Ａに示すように、高抵抗導体１２２は、絶縁体１２１が閾値を超える温度になるまで、絶縁体１２１の内部に分散した状態で含まれていてもよい。 (Modification example)
In the above-described embodiment, the insulator 121 and the high resistance conductor 122 cover the bus bar 110 in a layered state. However, as shown in FIG. 8A, the high resistance conductor 122 may be contained in a dispersed state inside the insulator 121 until the temperature of the insulator 121 exceeds the threshold value.

絶縁体１２１を構成する材料は、第１実施形態において上述した材料と同様である。 The material constituting the insulator 121 is the same as the material described above in the first embodiment.

高抵抗導体１２２を構成する材料は、セラミック粉やガラス繊維である。 The material constituting the high resistance conductor 122 is ceramic powder or glass fiber.

保護カバー１２０の温度が閾値よりも高い温度になると、絶縁体１２１が溶融する。このとき、図８Ｂに示すように、絶縁体１２１に分散した状態で含まれる高抵抗導体１２２は、バスバ１１０を覆った状態で残る。これにより、保護カバー１２０が高抵抗導体１２２を有していない場合と比較して、短絡経路Ｒ（図７Ｂ参照）に流れる電流値は小さくなる。そのため、保護カバー１２０が高抵抗導体１２２を有していない場合と比較して、電池パック１の内部に過大な電流が流れることを防止できる。 When the temperature of the protective cover 120 becomes higher than the threshold value, the insulator 121 melts. At this time, as shown in FIG. 8B, the high resistance conductor 122 contained in the insulator 121 in a dispersed state remains in a state of covering the bus bar 110. As a result, the current value flowing in the short-circuit path R (see FIG. 7B) becomes smaller than that in the case where the protective cover 120 does not have the high resistance conductor 122. Therefore, it is possible to prevent an excessive current from flowing inside the battery pack 1 as compared with the case where the protective cover 120 does not have the high resistance conductor 122.

本変形例に係る電池パック１によれば、高抵抗導体１２２を絶縁体１２１の内部に分散させるという簡便な方法によって、保護カバー１２０を形成することができる。そのため、本実施形態に係る電池パック１によれば、電池パック１の製造が容易になる。 According to the battery pack 1 according to the present modification, the protective cover 120 can be formed by a simple method of dispersing the high resistance conductor 122 inside the insulator 121. Therefore, according to the battery pack 1 according to the present embodiment, the battery pack 1 can be easily manufactured.

（第２実施形態）
上述した第１実施形態では、保護カバー１２０は、絶縁体１２１および高抵抗導体１２２を含んでいた。しかしながら、図９Ａおよび図９Ｂに示すように、保護カバー１２０は、
閾値を超える温度において炭化する絶縁材料を含み、絶縁材料が炭化することによって、パックケース２０よりも大きな電気抵抗となってもよい。 (Second Embodiment)
In the first embodiment described above, the protective cover 120 includes an insulator 121 and a high resistance conductor 122. However, as shown in FIGS. 9A and 9B, the protective cover 120 is
It contains an insulating material that carbonizes at a temperature exceeding a threshold value, and the insulating material may be carbonized to have a higher electric resistance than that of the pack case 20.

閾値を超える温度において炭化する絶縁材料は例えば、ポリブチレンテレフタレート（ＰＢＴ）、シリコン、ポリイミドなどの樹脂材料である。 The insulating material that carbonizes at a temperature exceeding the threshold value is, for example, a resin material such as polybutylene terephthalate (PBT), silicon, or polyimide.

図９Ｂに示すように、絶縁材料は、閾値を超える温度において炭化することによって、絶縁抵抗よりも小さく、かつ、パックケース２０よりも大きな電気抵抗を有する。これにより、電池パック１によれば、電池モジュール１００の異常発熱時に電池パック１の内部に形成される短絡経路Ｒ（図７Ｂ参照）に流れる電流値は小さくなる。そのため、電池パック１によれば、電池モジュール１００に異常発熱が生じた場合であっても、電池パック１の内部に過大な電流が流れることを防止できる。 As shown in FIG. 9B, the insulating material has a smaller electrical resistance than the insulating resistance and a larger electrical resistance than the pack case 20 by carbonizing at a temperature above the threshold. As a result, according to the battery pack 1, the current value flowing in the short-circuit path R (see FIG. 7B) formed inside the battery pack 1 when the battery module 100 abnormally generates heat becomes small. Therefore, according to the battery pack 1, even when abnormal heat generation occurs in the battery module 100, it is possible to prevent an excessive current from flowing inside the battery pack 1.

本変形例に係る電池パック１によれば、閾値を超える温度において炭化する絶縁材料によって構成するという簡便な方法によって、保護カバー１２０を形成できる。そのため、本実施形態に係る電池パック１によれば、電池パック１の製造が容易になる。 According to the battery pack 1 according to the present modification, the protective cover 120 can be formed by a simple method of being composed of an insulating material that carbonizes at a temperature exceeding a threshold value. Therefore, according to the battery pack 1 according to the present embodiment, the battery pack 1 can be easily manufactured.

（改変例）
上述した第１実施形態およびその変形例並びに第２実施形態では、保護カバー１２０は、バスバ１１０を電気的に保護した。しかしながら、保護カバー１２０は、入出力用部材１５０（導電部材に相当）を電気的に保護してもよい。 (Modified example)
In the first embodiment and its modifications and the second embodiment described above, the protective cover 120 electrically protects the bus bar 110. However, the protective cover 120 may electrically protect the input / output member 150 (corresponding to the conductive member).

以下では、保護カバー１２０が負極側の入出力用部材１５２を電気的に保護する場合を例に説明する。しかしながら、保護カバー１２０は、正極側の入出力用部材１５１を電気的に保護してもよい。 Hereinafter, a case where the protective cover 120 electrically protects the input / output member 152 on the negative electrode side will be described as an example. However, the protective cover 120 may electrically protect the input / output member 151 on the positive electrode side.

図１０Ａおよび図１０Ｂに示すように、保護カバー１２０は、負極側の入出力用部材１５２を覆って配置され、負極側の入出力用部材１５２を電気的に保護する。 As shown in FIGS. 10A and 10B, the protective cover 120 is arranged so as to cover the input / output member 152 on the negative electrode side, and electrically protects the input / output member 152 on the negative electrode side.

電池パック１において、一の電池モジュール１００に異常発熱が生じると、当該電池モジュール１００近傍に配置されている保護カバー１２０が加熱される。加熱された保護カバー１２０の温度が上記閾値を超えると、絶縁体１２１が溶融する。 In the battery pack 1, when abnormal heat generation occurs in one battery module 100, the protective cover 120 arranged in the vicinity of the battery module 100 is heated. When the temperature of the heated protective cover 120 exceeds the above threshold value, the insulator 121 melts.

絶縁体１２１が溶融すると、負極側の入出力用部材１５２とパックケース２０との間において短絡が生じる可能性がある。負極側の入出力用部材１５２とパックケース２０との間の短絡は、負極側の入出力用部材１５２とパックケース２０とが接触して短絡する場合や、負極側の入出力用部材１５２が固定用梁２３に接触し、固定用梁２３を介して短絡する場合がある。第１実施形態において上述した場合と同様に、負極側の入出力用部材１５２とパックケース２０との間の短絡が２箇所において生じると、パックケース２０を介して、電池パック１内部に短絡経路Ｒが形成される。 When the insulator 121 melts, a short circuit may occur between the input / output member 152 on the negative electrode side and the pack case 20. A short circuit between the input / output member 152 on the negative electrode side and the pack case 20 may occur when the input / output member 152 on the negative electrode side and the pack case 20 are in contact with each other to cause a short circuit, or when the input / output member 152 on the negative electrode side is short-circuited. It may come into contact with the fixing beam 23 and cause a short circuit via the fixing beam 23. Similar to the case described above in the first embodiment, when a short circuit occurs at two points between the input / output member 152 on the negative electrode side and the pack case 20, a short circuit path is formed inside the battery pack 1 via the pack case 20. R is formed.

本変形例に係る電池パックによれば、保護カバー１２０が高抵抗導体１２２を有することによって、電池パック１内部に短絡経路Ｒが形成されても、短絡経路Ｒに流れる電流値は小さくなる。従って、本変形例に係る電池パックによれば、電池モジュール１００に異常発熱が生じた場合であっても、電池パックの内部に過大な電流が流れることを防止できる。 According to the battery pack according to the present modification, since the protective cover 120 has the high resistance conductor 122, even if the short-circuit path R is formed inside the battery pack 1, the current value flowing through the short-circuit path R becomes small. Therefore, according to the battery pack according to the present modification, it is possible to prevent an excessive current from flowing inside the battery pack even when abnormal heat generation occurs in the battery module 100.

以上、実施形態およびその変形例を通じて電池パックを説明したが、本発明は実施形態において説明した構成のみに限定されることはなく、特許請求の範囲の記載に基づいて適宜変更することが可能である。 Although the battery pack has been described above through the embodiments and modifications thereof, the present invention is not limited to the configuration described in the embodiments, and can be appropriately modified based on the description of the claims. be.

１ 電池パック、
１０ 組電池、
２０ パックケース、
１００ 電池モジュール、
１１０ バスバ（導電部材）、
１２０ 保護カバー（保護部材）、
１２１ 絶縁体、
１２２ 高抵抗導体、
１４０ モジュールケース、
１５０ 入出力用部材（導電部材）、
１５１ 正極側の入出力用部材（導電部材）、
１５２ 負極側の入出力用部材（導電部材）。 1 Battery pack,
10 sets of batteries,
20 pack case,
100 battery module,
110 Busba (conductive member),
120 Protective cover (protective member),
121 insulator,
122 high resistance conductor,
140 module case,
150 Input / output member (conductive member),
151 Input / output member (conductive member) on the positive electrode side,
152 Input / output member (conductive member) on the negative electrode side.

Claims (6)

導電部材を介して複数の電池モジュールを電気的に接続した組電池と、
前記組電池を収容する金属製のパックケースと、を有し、
前記組電池は、前記導電部材を覆って配置され、前記導電部材を電気的に保護する保護部材を有し、
前記保護部材は、前記電池モジュールの異常発熱によって前記保護部材の温度が閾値を超えるまで絶縁抵抗を有し、前記閾値よりも高い温度において、前記絶縁抵抗よりも小さく、かつ、前記パックケースよりも大きな電気抵抗を有し、
前記保護部材は、前記閾値を超えるまで前記絶縁抵抗を有するとともに、前記閾値よりも高い温度において溶融する絶縁体と、溶融温度が前記閾値よりも高く、かつ、前記パックケースよりも大きな電気抵抗を有する高抵抗導体と、を有し、
前記絶縁体および前記高抵抗導体は、層をなした状態で前記導電部材を覆っている、電池パック。 An assembled battery in which multiple battery modules are electrically connected via a conductive member,
It has a metal pack case for accommodating the assembled battery, and
The assembled battery is arranged so as to cover the conductive member, and has a protective member that electrically protects the conductive member.
The protective member has an insulating resistance until the temperature of the protective member exceeds a threshold value due to abnormal heat generation of the battery module, is smaller than the insulating resistance at a temperature higher than the threshold value, and is smaller than the pack case. Has a large electrical resistance ,
The protective member has the insulating resistance until it exceeds the threshold value, and has an insulator that melts at a temperature higher than the threshold value and an electric resistance having a melting temperature higher than the threshold value and larger than the pack case. Has a high resistance conductor, and has
A battery pack in which the insulator and the high resistance conductor cover the conductive member in a layered state . 導電部材を介して複数の電池モジュールを電気的に接続した組電池と、
前記組電池を収容する金属製のパックケースと、を有し、
前記組電池は、前記導電部材を覆って配置され、前記導電部材を電気的に保護する保護部材を有し、
前記保護部材は、前記電池モジュールの異常発熱によって前記保護部材の温度が閾値を超えるまで絶縁抵抗を有し、前記閾値よりも高い温度において、前記絶縁抵抗よりも小さく、かつ、前記パックケースよりも大きな電気抵抗を有し、
前記保護部材は、前記閾値を超えるまで前記絶縁抵抗を有するとともに、前記閾値よりも高い温度において溶融する絶縁体と、溶融温度が前記閾値よりも高く、かつ、前記パックケースよりも大きな電気抵抗を有する高抵抗導体と、を有し、
前記高抵抗導体は、前記絶縁体が前記閾値を超える温度になるまで、前記絶縁体の内部に分散した状態で含まれている、電池パック。 An assembled battery in which multiple battery modules are electrically connected via a conductive member,
It has a metal pack case for accommodating the assembled battery, and
The assembled battery is arranged so as to cover the conductive member, and has a protective member that electrically protects the conductive member.
The protective member has an insulating resistance until the temperature of the protective member exceeds a threshold value due to abnormal heat generation of the battery module, is smaller than the insulating resistance at a temperature higher than the threshold value, and is smaller than the pack case. Has a large electrical resistance,
The protective member has the insulating resistance until it exceeds the threshold value, and has an insulator that melts at a temperature higher than the threshold value and an electric resistance having a melting temperature higher than the threshold value and larger than the pack case. Has a high resistance conductor, and has
A battery pack in which the high resistance conductor is dispersed inside the insulator until the temperature of the insulator exceeds the threshold value . 組電池と、前記組電池を収容する金属製のパックケースと、を有する電池パックにおいて、複数の電池モジュールを電気的に接続する導電部材であって、 A conductive member that electrically connects a plurality of battery modules in a battery pack having a battery pack and a metal pack case for accommodating the battery pack.
前記導電部材は、前記導電部材を電気的に保護する保護部材によって覆われ、 The conductive member is covered with a protective member that electrically protects the conductive member.
前記保護部材は、前記電池モジュールの異常発熱によって前記保護部材の温度が閾値を超えるまで絶縁抵抗を有し、前記閾値よりも高い温度において、前記パックケースよりも大きな電気抵抗を有し、 The protective member has an insulating resistance until the temperature of the protective member exceeds a threshold value due to abnormal heat generation of the battery module, and has a larger electric resistance than the pack case at a temperature higher than the threshold value.
前記保護部材は、前記閾値を超えるまで前記絶縁抵抗を有するとともに、前記閾値よりも高い温度において溶融する絶縁体と、溶融温度が前記閾値よりも高く、かつ、前記パックケースよりも大きな電気抵抗を有する高抵抗導体と、を有し、 The protective member has the insulating resistance until it exceeds the threshold value, and has an insulator that melts at a temperature higher than the threshold value and an electric resistance having a melting temperature higher than the threshold value and larger than the pack case. Has a high resistance conductor, and has
前記絶縁体および前記高抵抗導体は、層をなした状態で前記導電部材を覆っている、導電部材。 The insulator and the high resistance conductor are conductive members that cover the conductive member in a layered state. 組電池と、前記組電池を収容する金属製のパックケースと、を有する電池パックにおいて、複数の電池モジュールを電気的に接続する導電部材であって、 A conductive member that electrically connects a plurality of battery modules in a battery pack having a battery pack and a metal pack case for accommodating the battery pack.
前記導電部材は、前記導電部材を電気的に保護する保護部材によって覆われ、 The conductive member is covered with a protective member that electrically protects the conductive member.
前記保護部材は、前記電池モジュールの異常発熱によって前記保護部材の温度が閾値を超えるまで絶縁抵抗を有し、前記閾値よりも高い温度において、前記パックケースよりも大きな電気抵抗を有し、 The protective member has an insulating resistance until the temperature of the protective member exceeds a threshold value due to abnormal heat generation of the battery module, and has a larger electric resistance than the pack case at a temperature higher than the threshold value.
前記保護部材は、前記閾値を超えるまで前記絶縁抵抗を有するとともに、前記閾値よりも高い温度において溶融する絶縁体と、溶融温度が前記閾値よりも高く、かつ、前記パックケースよりも大きな電気抵抗を有する高抵抗導体と、を有し、 The protective member has the insulating resistance until it exceeds the threshold value, and has an insulator that melts at a temperature higher than the threshold value and an electric resistance having a melting temperature higher than the threshold value and larger than the pack case. Has a high resistance conductor, and has
前記高抵抗導体は、前記絶縁体が前記閾値を超える温度になるまで、前記絶縁体の内部に分散した状態で含まれている、導電部材。 The high resistance conductor is a conductive member contained in a state of being dispersed inside the insulator until the temperature of the insulator exceeds the threshold value. 導電部材を介して複数の電池モジュールを電気的に接続した組電池と、前記組電池を収容する金属製のパックケースと、を有する電池パックにおいて、前記導電部材を保護する保護部材であって、 A protective member that protects the conductive member in a battery pack having an assembled battery in which a plurality of battery modules are electrically connected via a conductive member and a metal pack case for accommodating the assembled battery.
前記導電部材を覆って配置され、前記導電部材を電気的に保護し、 It is arranged so as to cover the conductive member to electrically protect the conductive member.
前記電池モジュールの異常発熱によって前記保護部材の温度が閾値を超えるまで絶縁抵抗を有し、前記閾値よりも高い温度において、前記パックケースよりも大きな電気抵抗を有し、 It has an insulating resistance until the temperature of the protective member exceeds a threshold value due to abnormal heat generation of the battery module, and has a larger electric resistance than the pack case at a temperature higher than the threshold value.
前記閾値を超えるまで前記絶縁抵抗を有するとともに、前記閾値よりも高い温度において溶融する絶縁体と、溶融温度が前記閾値よりも高く、かつ、前記パックケースよりも大きな電気抵抗を有する高抵抗導体と、を有し、 An insulator having the insulation resistance until the threshold value is exceeded and melting at a temperature higher than the threshold value, and a high resistance conductor having a melting temperature higher than the threshold value and having an electric resistance larger than that of the pack case. Have,
前記絶縁体および前記高抵抗導体は、層をなした状態で前記導電部材を覆っている、保護部材。 The insulator and the high resistance conductor are protective members that cover the conductive member in a layered state. 導電部材を介して複数の電池モジュールを電気的に接続した組電池と、前記組電池を収容する金属製のパックケースと、を有する電池パックにおいて、前記導電部材を保護する保護部材であって、 A protective member that protects the conductive member in a battery pack having an assembled battery in which a plurality of battery modules are electrically connected via a conductive member and a metal pack case for accommodating the assembled battery.
前記導電部材を覆って配置され、前記導電部材を電気的に保護し、 It is arranged so as to cover the conductive member to electrically protect the conductive member.
前記電池モジュールの異常発熱によって前記保護部材の温度が閾値を超えるまで絶縁抵抗を有し、前記閾値よりも高い温度において、前記パックケースよりも大きな電気抵抗を有し、 It has an insulating resistance until the temperature of the protective member exceeds a threshold value due to abnormal heat generation of the battery module, and has a larger electric resistance than the pack case at a temperature higher than the threshold value.
前記閾値を超えるまで前記絶縁抵抗を有するとともに、前記閾値よりも高い温度において溶融する絶縁体と、溶融温度が前記閾値よりも高く、かつ、前記パックケースよりも大きな電気抵抗を有する高抵抗導体と、を有し、 An insulator having the insulation resistance until the threshold value is exceeded and melting at a temperature higher than the threshold value, and a high resistance conductor having a melting temperature higher than the threshold value and having an electric resistance larger than that of the pack case. Have,
前記高抵抗導体は、前記絶縁体が前記閾値を超える温度になるまで、前記絶縁体の内部に分散した状態で含まれている、保護部材。 The high resistance conductor is a protective member included in a state of being dispersed inside the insulator until the temperature of the insulator exceeds the threshold value.
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