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  • Summary & Details

Vibration Resistance Development for High Voltage Battery Technology

高電圧電池パックの耐振動性開発

Detailed Information

Category(J)論文

Translation

Category(E)Technical Papers and Explanation
Author(J)1) 伊藤 智昭, 2) 丹羽 貴大, 3) 花田 裕, 4) 岸田 直樹, 5) 鍋島 範之
Author(E)1) Tomoaki Ito, 2) Takahiro Niwa, 3) Yu Hanada, 4) Naoki Kishida, 5) Noriyuki Nabeshima
Affiliation(J)1) マツダ, 2) マツダ, 3) マツダ, 4) マツダ, 5) マツダ
Affiliation(E)1) MAZDA, 2) MAZDA, 3) MAZDA, 4) MAZDA, 5) MAZDA
Abstract(J)マツダはクルマのライフサイクル全体でのCO2 排出量を考え,各国に対応できるマルチソリューション戦略を推進している。今回,カーボンニュートラル実現の第一歩であるマツダ初の量産電気自動車であるMX 30 EV MODEL を開発した。MX 30 に搭載する高電圧電池は,お客様の求める走行距離,走行加速性能,回生ブレーキ性能,充電時間といった商品性能を実現しつつ,安全性能,信頼性能,高寿命,低重量を満足するよう材料選定や部品配置の最適化を目指した。本稿では,安全信頼性能の一つである耐振動性能開発について紹介する。高電圧電池パックは多数の電子部品から構成されており,振動伝搬が複雑化している。そのため,それぞれの部品の耐振動性を保証しながら最適な部品配置を実現できる開発と解析精度の向上が必要である。 振動開発では,振動の伝達を考慮した各部位への共振周波数のコントロールを決めた。そして,モデルを活用した振動に対するレイアウトの開発要素を見定め,応力を低減する形状・締結方法などに変更した。更に,実機の振動評価のコリレーションを行いモデルに反映できていない部分を見極め,より実機に近いモデルで解析することで耐振動性能の高い高電圧電池パックを開発した。

Translation

Abstract(E)Mazda has been promoting a multi-solution strategy responding to each country’s demand, considering CO2 emissions throughout the life cycles of vehicles. This time, we have developed Mazda’s first mass-produced BEV, MX 30, which is the first step for carbon neutrality. The high-voltage battery installed in the MX 30 satisfies customers’ requirements by optimizing the materials and layouts, including safety and reliability performance, long life, low cost, and light weight, while realizing product performances such as mileage, driving dynamics, regeneration performance, and charging time. This technical report introduces the development of vibration resistance that is one of the safety and reliability performances. The high-voltage battery pack is composed of many electronic components, which complicates the vibration propagation. Therefore, it was necessary to establish a development process for the optimum components layout while guaranteeing the vibration resistance of each component and to improve the accuracy of analyses. As a vibration-resistance development process, taking into consideration of the way of vibration transmission, we have defined the concept of controlling resonance frequencies transmitted to each component, then determined Weak-Points of the layout against vibrations by using models, and changed the shapes and fastening methods of the components to release stress. We have also performed vibration evaluation to examine correlations between predictions made by a model and results gained on actual machine, and identified areas not reflected in the models. As a result, we have developed a high-voltage battery pack with high vibration resistance through analyses using the model which was closer to the actual machine.

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