基于传递路径改进的车用电池包减振降噪

针对车用电池包内由继电器振动所引发的噪声问题，首先，通过电池包的声振试验并结合频率响应函数和电池包壳体振动频谱特性的分析，找出了电池包的噪声源；其次，基于继电器振动的传递路径改进设计了一款低刚度隔振垫，用于过滤继电器中的低频振动，从而实现电池包的降噪。结果表明：电池包内继电器的振动主要是由刚性连接的螺栓直接传递给继电器附近的电池包壳体，从而引发壳体共振并向外辐射噪声；所设计的隔振垫可很好地过滤继电器中低频的振动且达到了较好的降噪效果；在电池包上盖板打开的状态下，总声压级下降了约6dB；在电池包上盖板密封的状态下，总声压级降低了将近11dB。

Vibration and Noise Reduction of Battery Pack in Vehicle Based on the Improvement of Transfer Path

This paper aims at the reduction of noise derived from the vibration of relay. Firstly, the noise source of the battery pack is found out through the vibroacoustic test, combining the frequency response function with the vibration spectrum characteristics. Secondly, based on the improvement of transfer path of the vibration of relay, a kind of rubber isolation pad with low stiffness is designed to filter the medium and low frequency vibration of relay so as to realize the noise reduction of the battery pack. Finally, the results indicate that the vibration of relay is passed directly to the shell of battery pack by the rigid connected bolt, which results in the vibration of shell and radiated noise. The rubber isolation pad designed in this paper can effectively filter the medium and low frequency vibration of relay to realize the noise reduction. When the upper cover plate is open, the total sound pressure level is reduced by about 6 dB; when the upper cover plate is closed, the total sound pressure level drops nearly 11dB.