为研究电池循环老化对锂离子电池力学性能影响,通过对不同循环次数的电池单体及组分压缩试验,分析循环次数对电池单体和电池组分材料的失效情况（失效位移和失效载荷）及电池组分材料杨氏模量分布的影响。结果表明：电池的失效位移符合正态分布特征,循环老化导致锂离子电池在压缩状态下提前出现失效,其中在压痕工况下,电池的失效位移从6.0 mm降至5.0 mm;平板压缩工况下电池的失效位移从6.8 mm降至6.4 mm。在100次循环老化条件下,电池阳极的杨氏模量从434.1 MPa提高到725.2 MPa,电池组分的杨氏模量也均符合正态分布。
Abstract
In order to study the effect of battery cyclic aging on the mechanical properties of lithium-ion batteries, the paper analyzes the effect of the cycle number on the failure of battery cells and battery component materials （failure displacement and failure load） and the distribution of Young’s modulus of battery component materials through the compression test of battery cells and components with different number of cycles. The results show that the failure displacement of the battery conforms to the normal distribution characteristics, and the cycle aging leads to the earlier failure of lithium-ion batteries under compression, in which the failure displacement of the battery decreases from 6.0 mm to 5.0 mm under the indentation condition, and that of the battery decreases from 6.8 mm to 6.4 mm under the flat-plate compression condition, and under the condition of 100 aging cycles, the Young’s modulus of the anode of the battery increases from 434.1 MPa to 725.2 MPa, and the Young’s modulus of the battery components also conforms to a normal distribution.
关键词
锂离子电池 /
力学性能 /
机械滥用 /
失效分析 /
老化 /
材料特性分布
Key words
lithium-ion batteries /
mechanical properties /
mechanical abuse /
failure analysis /
aging /
material property distribution
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