电池包箱体跌落挤压动力学分析与结构优化

许莎; 陈浩; 杨亚莉; 蔡丽红

doi:10.13433/j.cnki.1003-8728.20220145

电池包箱体跌落挤压动力学分析与结构优化

doi: 10.13433/j.cnki.1003-8728.20220145

上海工程技术大学机械与汽车工程学院, 上海 201620

基金项目:

上海市曙光计划项目 19SG51

详细信息

作者简介:
许莎(1977-), 讲师, 博士, 研究方向为汽车轻量化与可靠性设计, xytongxing376@sina.com

通讯作者:
陈浩, 教授, 博士, pschenhao@163.com

中图分类号: U469.72
计量
- 文章访问数: 144
- HTML全文浏览量: 114
- PDF下载量: 32
- 被引次数: 0
出版历程
- 收稿日期: 2021-10-21
- 刊出日期: 2023-10-25

Drop & Extrusion Analysis and Structural Optimization of Battery Pack Box

School of Mechanical and Automotive Engineering, Shanghai University of Engineering Science, Shanghai 201620, China

摘要

摘要: 为改善电池包箱体的耐冲击性能, 以某款物流车动力电池包为研究对象, 综合考虑电池包的跌落和挤压问题, 分析了不同跌落高度、跌落角度以及不同挤压方向工况下电池包箱体的动力学响应。根据分析结果, 以电池包箱体安全性能作为优化目的, 以电池包箱体尺寸参数作为设计变量, 对电池包箱体进行了多目标尺寸优化, 并通过跌落试验验证了优化效果。结果表明, 优化后电池包箱体的强度得到了提高, 动力学响应满足跌落和挤压工况的要求, 验证了本文电池包动力学分析与结构优化方法的正确性。
- 电池包箱体 /
- 跌落 /
- 挤压 /
- 动力学响应 /
- 多目标优化
Abstract: In order to improve the impact resistance of the battery pack box, the battery pack of a certain logistics vehicle was taken as the research object, and the dynamic analysis of the battery pack under drop and extrusion conditions was carried out. The effects of different drop height, drop angle and extrusion direction on the dynamic response of battery pack box were analyzed. According to the analysis result, with the safety performance of the battery pack box as the optimization purpose, and the size parameters of the battery pack box as the design variable, the multi-objective size optimization of the battery pack box was performed, and the optimization effect was verified by the drop test. The results show that the strength of the battery pack box is improved after optimization, and the dynamic response meets the requirements of drop and extrusion conditions, which verifies the correctness of the battery pack structure optimization design method in this paper.
- battery pack box /
- drop /
- extrusion /
- dynamic response /
- multi-objective optimization

HTML全文

图 1 电池包箱体跌落模型

Figure 1. Drop model of a battery pack box

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图 2 不同跌落高度的等效应力

Figure 2. Equivalent stress at different drop heights

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图 3 不同跌落角度的等效应力

Figure 3. Equivalent stress at different drop angles

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图 4 电池包箱体挤压模型

Figure 4. Extrusion model of a battery pack box

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图 5 电池包箱体挤压分析的等效应力

Figure 5. Equivalent stress of battery pack box extrusion

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图 6 吊耳变形

Figure 6. Deformation of lifting lug

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图 7 下箱体变形

Figure 7. Deformation of a lower box

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图 8 电池包箱体跌落云图

Figure 8. Contours of battery pack box drop

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图 9 电池包箱体挤压云图

Figure 9. Contours of battery pack box extrusion

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图 10 预处理

Figure 10. Pretreatment

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图 11 跌落试验

Figure 11. Drop Test

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表 1 材料基本参数

Table 1. Basic parameters of materials

名称	密度/(t·mm^-3)	弹性模量/MPa	泊松比
箱体	7.89×10^-9	2.1×10⁵	0.3
模组	2.1×10^-9	7 000	0.32

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表 2 跌落优化前后对比

Table 2. Comparison before and after drop optimization

名称	优化前	优化后
上箱体厚度/mm	2.00	1.2
下箱体厚度/mm	2.00	2.97
最大等效应力/MPa	331.60	329.88
最大有效塑性应变	0.24	0.19
总重量/t	0.390	0.389

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表 3 挤压优化前后对比

Table 3. Comparison before and after extrusion optimization

名称	优化前	优化后
上箱体厚度/mm	2	1.43
下箱体厚度/mm	2	2.73
吊耳厚度/mm	2	3.85
最大等效应力/MPa	301.2	298.97
最大有效塑性应变	0.8	0.74
下箱体侵入量/mm	20.3	16.31

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表 4 电池包前10阶固有频率

Table 4. The first ten natural frequencies of the battery pack box Hz

阶数	优化前	优化后	主要振型	变化量
1	22.2	37.0	模组和隔板共振	+14.8
2	24.6	39.2	上箱体共振	+14.6
3	28.6	39.2	上箱体共振	+10.6
4	29.5	41.1	隔板共振	+11.6
5	29.6	43.7	隔板共振加重	+14.1
6	29.7	43.8	隔板共振	+14.4
7	29.8	44.2	隔板共振加重	+14.4
8	29.9	44.6	隔板共振加重	+14.7
9	30.1	44.8	隔板共振减小	+14.7
10	30.1	45.2	隔板共振	+15.1

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