提出一种具有优异导热性能和防漏性能的新型复合相变材料（CPCM）,采用膨胀石墨（EG）与硅藻土的联合互交网格,可显著提高相变材料的吸附能力和导热性能。测试结果表明,含10%硅藻土和6% EG的样品14在50 ℃下加热5 h,表面仍无渗漏现象,同时PEG含量达到90%,且在热循环测试中也呈现出优良的稳定性;将电池与样品14耦合后,测试电池在8种工作模式下的温度变化,在2C（C为电池充放电能力倍率）模式下,当电池在较高初始温度（30 ℃）下工作时,其最高工作温度仍可控制在40 ℃以下,每个电池之间的温差可限制在约2 ℃;同时样品14在低温下可为电池系统提供优异的保温性能,电池的放电效率提高约16.07%,当T0=30 ℃时,在1C模式下,电池放电效率达到91.67%。
Abstract
At present, the lithium battery thermal management system using phase change materials （PCM） has been widely used, but how to solve the problems of leakage and low thermal conductivity of phase change materials is still a wide range of research prospects. Especially in high power working condition, the temperature of the battery is still not well controlled. In this paper, a new type of composite phase change material （CPCM） with excellent thermal conductivity and leak-proof performance is proposed. The joint cross-cross mesh of expanded graphite （EG） and diatomite can significantly improve the adsorption capacity and thermal conductivity of the CPCM. The results show that the CPCM containing 10% diatomite and 6% EG is heated at 50 ℃ for 5 h and there is still no surface leakage, the PEG content reach 90%. The samples also show excellent stability in the thermal cycle test. After coupling the battery to the CPCM, we test the temperature variation of the battery under 8 different operating modes. Especially in 2C mode, when the battery is operating at a higher initial temperature （30 ℃）, its maximum operating temperature can still be controlled below 40 ℃, and the temperature difference between each battery can be limited to about 2 ℃. At the same time, it is found that CPCM can provide excellent insulation performance for battery system at low temperature. After coupling with the CPCM, the discharge efficiency of the battery is improved by about 16.07%. When T0=30 ℃, the battery discharge efficiency reaches 91.67% at 1C mode. These excellent physical properties can enable CPCM-lithium battery composite model to be applied in a wider range of fields.
关键词
相变材料 /
电池管理系统 /
导热 /
高防漏 /
电池效率
Key words
phase change materials /
battery management system /
thermal conductivity /
high leak proof /
cell efficiency
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基金
安徽省重点研发计划（S202203f07020001）; 中央高校基本科研业务费项目（PA2021KCPY0029）; 研究生学术创新（2022xscx022）
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