Koller Markus, Glanz Gregor, Bergmann Alexander, Popp Hartmut
Center for Low-Emission Transport, AIT Austrian Institute of Technology GmbH, Giefinggasse 2, 1210 Vienna, Austria.
Institute of Electrical Measurement and Sensor Systems, Graz University of Technology, Inffeldgasse 33/I, 8010 Graz, Austria.
Sensors (Basel). 2022 Jun 23;22(13):4748. doi: 10.3390/s22134748.
This work presents a method to determine the type of Lamb mode (antisymmetric or symmetric) that propagates through a lithium-ion pouch cell. To determine the type of mode and the group velocity at a specific frequency, two- and three-transducer setups were created. For these setups, it is important that all transducers have the same polarization direction. Two transducers are affixed to the center of the cell at a distance of several centimeters from each other so that the group velocity can be determined. Using cross-correlation, the group velocity of the emerging mode can be calculated. The measurement setup and the processing method was first validated with experiments on acrylic glass and aluminum plates. The measurements were supported with FEM simulations and a numerically calculated model. The output voltages of the receiving piezo-elements obtained in the FEM simulation are in agreement with the underlying theories. The phase shift, which results from the output voltage of the piezo-elements mounted one above the other on different sides of the plate, shows the type of mode. The results of the experimental determination of the Lamb mode that propagates through a lithium-ion pouch cell were validated with a numerically calculated multi-layer model and therefore validate this novel experimental approach.
这项工作提出了一种确定在锂离子软包电池中传播的兰姆波模式类型（反对称或对称）的方法。为了确定特定频率下的模式类型和群速度，创建了双换能器和三换能器设置。对于这些设置，所有换能器具有相同的极化方向非常重要。两个换能器固定在电池中心，彼此相距几厘米，以便确定群速度。使用互相关，可以计算出出现模式的群速度。测量设置和处理方法首先通过在丙烯酸玻璃和铝板上的实验进行了验证。测量得到了有限元模拟和数值计算模型的支持。在有限元模拟中获得的接收压电元件的输出电压与基础理论一致。由安装在板不同侧面上彼此叠放的压电元件的输出电压产生的相移显示了模式类型。通过数值计算的多层模型验证了在锂离子软包电池中传播的兰姆波模式的实验测定结果，因此验证了这种新颖的实验方法。
