JP6376082B2 - Battery pack - Google Patents

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JP6376082B2
JP6376082B2 JP2015170904A JP2015170904A JP6376082B2 JP 6376082 B2 JP6376082 B2 JP 6376082B2 JP 2015170904 A JP2015170904 A JP 2015170904A JP 2015170904 A JP2015170904 A JP 2015170904A JP 6376082 B2 JP6376082 B2 JP 6376082B2
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battery
ecu
monitoring unit
assembled battery
battery pack
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JP2017050093A (en
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浩一 長峰
浩一 長峰
尚憲 熊谷
尚憲 熊谷
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Toyota Motor 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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Description

本発明は、組電池と、組電池を監視する監視ユニットを内蔵した電池パックに関し、特にその構造に関する。   The present invention relates to an assembled battery and a battery pack including a monitoring unit for monitoring the assembled battery, and more particularly to the structure thereof.

複数の単電池から構成された組電池と、組電池を監視し、必要に応じて制御を行う監視ユニットを内蔵した電池パックが知られている。下記特許文献１には、ハイブリッド車両に搭載されたＨＶバッテリ（１３）が示されている。ＨＶバッテリには、車両駆動用の電動機に電力を供給するバッテリモジュール（１３１）と、バッテリモジュールを監視する電池監視ユニット(１３２)と、バッテリモジュールからの電力供給を遮断するためのリレーを備えるジャンクションブロック（１３３）が内蔵されている。下記特許文献１では、浸水センサを設け、浸水が検知されると、ジャンクションブロック内のリレーを制御し、単電池間に設けられたヒューズ（１３１ｂ）を溶断し、電源を遮断している。なお、（ ）内の符号は、記特許文献１にて用いられている符号であり、本願の実施の形態で用いられる符号と関連しない。   There is known a battery pack that includes an assembled battery composed of a plurality of single cells and a monitoring unit that monitors the assembled battery and performs control as necessary. Patent Document 1 below shows an HV battery (13) mounted on a hybrid vehicle. The HV battery includes a battery module (131) that supplies electric power to the electric motor for driving the vehicle, a battery monitoring unit (132) that monitors the battery module, and a relay that cuts off power supply from the battery module. A block (133) is incorporated. In the following Patent Document 1, a water immersion sensor is provided, and when water is detected, the relay in the junction block is controlled, the fuse (131b) provided between the single cells is blown, and the power supply is shut off. In addition, the code | symbol in () is a code | symbol used in the patent document 1, and is not related with the code | symbol used in embodiment of this application.

特開２０１３−１１０８１３号公報JP 2013-110814 A

低コスト化のために浸水センサを廃止したいという要請がある。本発明は、浸水センサを廃止した場合であっても、電池パックの浸水時の安全性を確保することを目的とする。   There is a request to abolish the inundation sensor for cost reduction. An object of the present invention is to ensure safety when a battery pack is submerged even when the submersion sensor is abolished.

本発明にかかる電池パックは、組電池と、組電池を監視する監視ユニットと、監視ユニットを収容し、内部を防水する監視ユニットケースと、組電池、監視ユニットおよび監視ユニットケースを収容する電池ケースと、を有する。監視ユニットは、組電池の電圧を検出するために、配線によって組電池と接続されている。監視ユニットは、組電池から延びるこの配線を受ける電圧検出用コネクタを有している。電圧検出用コネクタは、電池パック内の他の活電部に比べて高い位置に配置されている。   A battery pack according to the present invention includes an assembled battery, a monitoring unit that monitors the assembled battery, a monitoring unit case that houses the monitoring unit and waterproofs the inside, and a battery case that houses the assembled battery, the monitoring unit, and the monitoring unit case And having. The monitoring unit is connected to the assembled battery by wiring in order to detect the voltage of the assembled battery. The monitoring unit has a voltage detection connector that receives this wiring extending from the assembled battery. The voltage detection connector is arranged at a higher position than the other live parts in the battery pack.

電圧検出用コネクタでは、組電池の正負の端子に接続している端子が近接しており、浸水時にはこれらの端子間で放電する可能性が高い。監視ユニットを監視ユニットケースに収めることにより、浸水を遅らせることができ、さらに、電圧検出用コネクタを最も高い位置に配置することで、最後に浸水するようにできる。   In the voltage detection connector, the terminals connected to the positive and negative terminals of the assembled battery are close to each other, and there is a high possibility of discharging between these terminals when flooded. By placing the monitoring unit in the monitoring unit case, it is possible to delay the flooding. Furthermore, by placing the voltage detection connector at the highest position, it is possible to flood the water last.

本発明によれば、浸水時において、電池パック内の放電に関する安全性が確保される。   According to the present invention, safety related to the discharge in the battery pack is ensured during flooding.

電池パックの概略構成を示す図である。It is a figure which shows schematic structure of a battery pack. 電池パック等の概略の回路構成を示す図である。It is a figure which shows schematic circuit structures, such as a battery pack. ＥＣＵ収容ケースの構造を示す分解斜視図である。It is a disassembled perspective view which shows the structure of ECU accommodation case. ＥＣＵ収容ケースの構造を示す断面図である。It is sectional drawing which shows the structure of ECU accommodation case.

以下、本発明の実施形態を図面に従って説明する。図１は、ハイブリッド車両（ＨＶ）や電気自動車等の駆動用モータに電力を供給する電池パック１０の概略構成を示す透視図である。以下では、ハイブリッド車両を例に挙げて説明する。   Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a perspective view showing a schematic configuration of a battery pack 10 that supplies electric power to a drive motor such as a hybrid vehicle (HV) or an electric vehicle. Hereinafter, a hybrid vehicle will be described as an example.

電池パック１０は、複数の単電池１２を電気的に接続した組電池１４と、組電池１４の管理および制御を行う監視ユニットである電池電子制御装置（以下、電池ＥＣＵと記す。）１６と、組電池１４を外部機器と接続、遮断するためのジャンクションブロック１８を有する。さらに、電池パック１０は、組電池１４、電池ＥＣＵ１６およびジャンクションブロック１８を収容する電池ケース２０を有する。電池ＥＣＵ１６は、ＥＣＵ収容ケース２２内に収められ、電池ケース２０内の組電池１４やジャンクションブロック１８等の他の電気素子から隔離されている。ＥＣＵ収容ケース２２は、電池ケース２０の一部と、ＥＣＵカバー２４から構成することができる。   The battery pack 10 includes an assembled battery 14 in which a plurality of unit cells 12 are electrically connected, a battery electronic control device (hereinafter referred to as a battery ECU) 16 that is a monitoring unit that manages and controls the assembled battery 14, and A junction block 18 for connecting and disconnecting the assembled battery 14 to and from an external device is provided. Furthermore, the battery pack 10 includes a battery case 20 that houses the assembled battery 14, the battery ECU 16, and the junction block 18. The battery ECU 16 is housed in the ECU housing case 22 and is isolated from other electric elements such as the assembled battery 14 and the junction block 18 in the battery case 20. The ECU housing case 22 can be constituted by a part of the battery case 20 and the ECU cover 24.

電池ＥＣＵ１６は、組電池１４の電圧、特に組電池の両極間の電圧を監視するために、組電池１４から延びる配線２６を受ける高圧コネクタ２８が設けられている。電池ＥＣＵ１６は、概略薄い直方体形状であり、ＥＣＵ収容ケース２２内で立てて配置され、このときの上縁近傍に高圧コネクタ２８が設けられている。高圧コネクタ２８は、電池ケース２０内の、高圧コネクタ２８以外の活電部（グランドに対し電位を有する部分）、例えば組電池１４を構成する個々の単電池１２、ジャンクションブロック１８内の回路素子やジャンクションブロック１８と他の機器を接続するためのコネクタ３０などより高い位置に配置されている。   The battery ECU 16 is provided with a high-voltage connector 28 that receives a wiring 26 extending from the assembled battery 14 in order to monitor the voltage of the assembled battery 14, particularly the voltage between both electrodes of the assembled battery. The battery ECU 16 has a substantially thin rectangular parallelepiped shape, and is placed upright in the ECU housing case 22, and a high voltage connector 28 is provided in the vicinity of the upper edge at this time. The high-voltage connector 28 is a live part (part having a potential with respect to the ground) other than the high-voltage connector 28 in the battery case 20, for example, individual cells 12 constituting the assembled battery 14, circuit elements in the junction block 18, It is arranged at a higher position than the connector 30 for connecting the junction block 18 and other devices.

図２は、電池パック１０内の回路構成および電池パック１０に接続される関連機器を示す図である。前述のように、電池パック１０は、組電池１４、電池ＥＣＵ１６およびジャンクションブロック１８を含む。電池ＥＣＵ１６は、ハイブリッド車両の動力装置の制御を統括するＨＶ−ＥＣＵ３２と電気的に接続されている。ＨＶ−ＥＣＵ３２は、電池ＥＣＵ１６の他、エンジンを制御するエンジンＥＣＵ（不図示）、電動機を制御する電動機ＥＣＵ（不図示）に電気的に接続されている。ＨＶ−ＥＣＵ３２は、アクセル、ブレーキ等の操作から運転者の要求を取得し、また車両に備えられた各種センサから車両の運行状況を取得し、これらの情報を統合して、各ＥＣＵを介して、エンジン、電動機、組電池等の制御を行う。   FIG. 2 is a diagram illustrating a circuit configuration in the battery pack 10 and related devices connected to the battery pack 10. As described above, the battery pack 10 includes the assembled battery 14, the battery ECU 16, and the junction block 18. The battery ECU 16 is electrically connected to an HV-ECU 32 that controls the power unit of the hybrid vehicle. In addition to the battery ECU 16, the HV-ECU 32 is electrically connected to an engine ECU (not shown) that controls the engine and an electric motor ECU (not shown) that controls the electric motor. The HV-ECU 32 obtains the driver's request from the operation of the accelerator, the brake, etc., obtains the operation status of the vehicle from various sensors provided in the vehicle, integrates these information, and passes through each ECU. Control engine, electric motor, battery pack, etc.

電力制御装置（ＰＣＵ）３４は、組電池１４の電力を電動機に供給し、また電動機が発電した電力を組電池１４に充電する制御を行う。組電池１４の直流電力は、電力制御装置３４により昇圧され、三相交流電力に変換されて車両駆動用の電動機に供給される。車両の制動時に電動機で発電された交流電力は、電力制御装置３４にて直流電力に変換され組電池１４に充電される。電力制御装置３４は、ジャンクションブロック１８を介して組電池１４に接続されている。ジャンクションブロック１８内には、リレーが備えられ、所定条件下で電池パック１０と電力制御装置３４の電気的接続を遮断する。   The power control unit (PCU) 34 performs control for supplying the electric power of the assembled battery 14 to the electric motor and charging the electric power generated by the electric motor to the assembled battery 14. The DC power of the assembled battery 14 is boosted by the power control device 34, converted into three-phase AC power, and supplied to the motor for driving the vehicle. The AC power generated by the electric motor during braking of the vehicle is converted into DC power by the power control device 34 and charged to the assembled battery 14. The power control device 34 is connected to the assembled battery 14 via the junction block 18. A relay is provided in the junction block 18 to cut off the electrical connection between the battery pack 10 and the power control device 34 under a predetermined condition.

図３、図４は、電池ＥＣＵ１６およびＥＣＵ収容ケース２２の構成を示す図である。ＥＣＵ収容ケース２２は、底面が電池ケース２０の一部で構成され、四方の側面および上面がＥＣＵカバー２４で構成される。ＥＣＵカバー２４は、電池ケース２０の底面に固定される下カバー３６と、下カバー３６の上に結合される上カバー３８を含む。下カバー３６は、電池ＥＣＵ１６の下部周囲を囲む壁を形成し、上カバー３８は下カバー３６の前記の壁に連続し、電池ＥＣＵ１６の上部の周囲を囲む壁と、上面を形成する。一体物の上カバー３８により、電池ＥＣＵ１６の上側部分が囲まれ、この中に高圧コネクタ２８が配置される。下カバー３６には、上カバー３８との合わせ面から掘り下げられた溝４０が設けられ、ここに配線２６が通されている。配線周囲は柔軟性または弾性のシール材４２が巻かれ、シール材４２によりＥＣＵカバー２４と配線２６の隙間が埋められている。また、配線２６は、細い電線が束ねられたものであり、シール材４２が巻かれた部分において、個々の電線の隙間がブチルゴム等の粘り気のある又は塑性変形可能なシール材（不図示）で埋められている。   3 and 4 are diagrams showing configurations of the battery ECU 16 and the ECU housing case 22. The ECU housing case 22 has a bottom surface constituted by a part of the battery case 20, and four side surfaces and an upper surface constituted by an ECU cover 24. The ECU cover 24 includes a lower cover 36 that is fixed to the bottom surface of the battery case 20 and an upper cover 38 that is coupled to the lower cover 36. The lower cover 36 forms a wall surrounding the lower periphery of the battery ECU 16, and the upper cover 38 continues to the wall of the lower cover 36 and forms an upper surface and a wall surrounding the upper periphery of the battery ECU 16. The upper cover 38 of the integral object surrounds the upper part of the battery ECU 16 and the high voltage connector 28 is disposed therein. The lower cover 36 is provided with a groove 40 dug down from the mating surface with the upper cover 38, and the wiring 26 is passed therethrough. A flexible or elastic sealing material 42 is wound around the wiring, and a gap between the ECU cover 24 and the wiring 26 is filled with the sealing material 42. Further, the wiring 26 is a bundle of thin electric wires, and in the portion where the sealing material 42 is wound, the gap between the individual electric wires is a sticky or plastically deformable sealing material (not shown) such as butyl rubber. Buried.

電池ケース２０と下カバー３６の合わせ面、下カバー３６と上カバー３８の合わせ面にはシール材、例えばシール用スポンジ（不図示）が配置され、上下のカバー３６，３８が組み付けられたときに合わせ面を水密にシールする。また、配線２６が貫通する部分は、前述のようにシール材４２等で水密にシールされる。これにより、ＥＣＵ収容ケース２２は、電池ＥＣＵ１６を防水状態で収容する。   When a sealing material, for example, a sealing sponge (not shown) is disposed on the mating surface of the battery case 20 and the lower cover 36 and the mating surface of the lower cover 36 and the upper cover 38, the upper and lower covers 36 and 38 are assembled. Seal the mating surfaces watertight. Further, the portion through which the wiring 26 penetrates is sealed in a watertight manner with the sealing material 42 or the like as described above. Thereby, ECU accommodation case 22 accommodates battery ECU16 in a waterproof state.

電池パック１０内で、最も高い電圧が生じるのは、組電池１４の両端の端子間である。この電圧は、ジャンクションブロック１８内の端子間、および電池ＥＣＵ１６の高圧コネクタ２８の端子間にかかる。特に、高圧コネクタ２８の端子同士は接近しているため、電池パック１０内に浸水があった場合、この部分で大きな電流が流れる放電が生じる可能性が高い。そこで、この電池パック１０は、高圧コネクタ２８を他の活電部より高い位置に配置し、浸水の可能性を低減している。   In the battery pack 10, the highest voltage is generated between the terminals at both ends of the assembled battery 14. This voltage is applied between the terminals in the junction block 18 and between the terminals of the high voltage connector 28 of the battery ECU 16. In particular, since the terminals of the high-voltage connector 28 are close to each other, if there is water in the battery pack 10, there is a high possibility that a discharge in which a large current flows in this portion will occur. Therefore, in this battery pack 10, the high voltage connector 28 is arranged at a position higher than other live parts to reduce the possibility of flooding.

また、防水されたＥＣＵ収容ケース２２内に電池ＥＣＵ１６を配置することでも高圧コネクタ２８が浸水する可能性を低減している。また、上カバー３８が一体ものであり下方にのみ開放しているので、電池パック１０およびＥＣＵ収容ケース２２内に浸水があったとしても、電池パック１０の上下方向が維持される限り、上カバー３８内には空気が残る。これによっても、上カバー３８内の高圧コネクタ２８が浸水する可能性が低減する。   The possibility of the high voltage connector 28 being submerged is also reduced by arranging the battery ECU 16 in the waterproof ECU housing case 22. Further, since the upper cover 38 is an integral part and is opened only downward, even if there is water in the battery pack 10 and the ECU housing case 22, as long as the vertical direction of the battery pack 10 is maintained, the upper cover 38 Air remains in 38. This also reduces the possibility of the high voltage connector 28 in the upper cover 38 being submerged.

また、電池パック１０の下側から浸水する場合には、高圧コネクタ２８より低い電圧の部分、また端子間隔が広い部分において、まず放電が始まる。このため、放電電流は比較的少なく、徐々に組電池１４の端子間電圧が低下する。高圧コネクタ２８が浸水することがあっても、それ以前に組電池１４の放電が始まっており、高圧コネクタ２８の端子間で大きな電圧が生じることが防止される。   When the battery pack 10 is submerged from the lower side, discharge starts first in a portion having a voltage lower than that of the high voltage connector 28 and a portion having a wide terminal interval. For this reason, the discharge current is relatively small, and the inter-terminal voltage of the assembled battery 14 gradually decreases. Even if the high voltage connector 28 may be submerged, the discharge of the assembled battery 14 has started before that, and a large voltage is prevented from being generated between the terminals of the high voltage connector 28.

１０ 電池パック、１２ 単電池、１４ 組電池、１６ 電池ＥＣＵ（監視ユニット）、１８ ジャンクションブロック、２０ 電池ケース、２２ ＥＣＵ収容ケース（監視ユニットケース）、２４ ＥＣＵカバー、２６ 配線、２８ 高圧コネクタ（電圧検出用コネクタ）、３０ コネクタ、３２ ＨＶ−ＥＣＵ、３４ 電力制御装置、３６ 下カバー、３８ 上カバー、４０ 溝、４２ シール材。   10 battery packs, 12 cells, 14 batteries, 16 battery ECU (monitoring unit), 18 junction block, 20 battery case, 22 ECU housing case (monitoring unit case), 24 ECU cover, 26 wiring, 28 high voltage connector (voltage) Connector for detection), 30 connector, 32 HV-ECU, 34 power control device, 36 lower cover, 38 upper cover, 40 groove, 42 sealing material.

Claims (1)

組電池と、
組電池を監視する監視ユニットと、
監視ユニットを収容し、内部を防水する監視ユニットケースと、
組電池、監視ユニットおよび監視ユニットケースを収容する電池ケースと、
を有し、
監視ユニットは、組電池の電圧を検出するための、組電池から延びる配線を受ける電圧検出用コネクタを有し、電圧検出用コネクタが電池パック内の他の活電部に比べて高い位置に配置されている、
電池パック。 An assembled battery;
A monitoring unit for monitoring the assembled battery;
A monitoring unit case that houses the monitoring unit and waterproofs the inside;
A battery case housing the assembled battery, the monitoring unit and the monitoring unit case;
Have
The monitoring unit has a voltage detection connector for receiving wiring extending from the assembled battery for detecting the voltage of the assembled battery, and the voltage detection connector is arranged at a higher position than other live parts in the battery pack. Being
Battery pack.
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