本文中对纯电动汽车用磷酸铁锂电池SOC估算方法进行研究。首先,利用基本的测试手段测得反映电池外特性的充放电电压曲线(V vs Q),并用它求得反映电池电化学特性的容量增量曲线(ΔQ/ΔV vs V)。接着,采用容量增量分析法研究充放电倍率、...本文中对纯电动汽车用磷酸铁锂电池SOC估算方法进行研究。首先,利用基本的测试手段测得反映电池外特性的充放电电压曲线(V vs Q),并用它求得反映电池电化学特性的容量增量曲线(ΔQ/ΔV vs V)。接着,采用容量增量分析法研究充放电倍率、温度和老化程度对电池性能的影响。最后,建立了电池内部相变阶段的容量增量峰与电池SOC的对应关系,并利用这一关系来估算电池SOC,为电动汽车制定动力电池管理策略提供依据。展开更多
In this paper,the content and density of adsorbed water in fine-grained soil are determined.According to the test results,the calculation method of compaction degree of the solid-phase and void ration of soil is impro...In this paper,the content and density of adsorbed water in fine-grained soil are determined.According to the test results,the calculation method of compaction degree of the solid-phase and void ration of soil is improved.Four kinds of fine-grained soils from different regions in China were selected,and the adsorbed water content and density of four kinds of fine-grained soils were determined by thermogravimetry and volumetric flask method.Furthermore,SEM and XRD experiments were used to analyze the differences in the ability of each soil sample to absorb water.In order to study the compression characteristics of adsorbed water,four saturated soil samples were tested by consolidation method.The results show that the desorption temperature range of the adsorbed water and its density were equal to 100−115℃and 1.30 g/cm^(3),respectively.Adsorbed water plays a positive role in keeping the compressibility of fine-grained soil at a low rate when it has high water content.Besides,adsorbed water can be a stable parameter and is difficult to discharge during the operation period of subgrade.The settlement of fine-grained soil embankment is predicted by engineering example,and compared with the result of conventional calculation method.The results show that it is more close to the field monitoring results by using the improved void ratio of soil as the parameter.展开更多
文摘本文中对纯电动汽车用磷酸铁锂电池SOC估算方法进行研究。首先,利用基本的测试手段测得反映电池外特性的充放电电压曲线(V vs Q),并用它求得反映电池电化学特性的容量增量曲线(ΔQ/ΔV vs V)。接着,采用容量增量分析法研究充放电倍率、温度和老化程度对电池性能的影响。最后,建立了电池内部相变阶段的容量增量峰与电池SOC的对应关系,并利用这一关系来估算电池SOC,为电动汽车制定动力电池管理策略提供依据。
基金Project(51978085)supported by the National Natural Science Foundation of ChinaProject(K2019G045)supported by the Science and Technology Research and Development Plan of China National Railway Group Co.,Ltd.Project(201808430102)supported by the China Scholarship Council。
文摘In this paper,the content and density of adsorbed water in fine-grained soil are determined.According to the test results,the calculation method of compaction degree of the solid-phase and void ration of soil is improved.Four kinds of fine-grained soils from different regions in China were selected,and the adsorbed water content and density of four kinds of fine-grained soils were determined by thermogravimetry and volumetric flask method.Furthermore,SEM and XRD experiments were used to analyze the differences in the ability of each soil sample to absorb water.In order to study the compression characteristics of adsorbed water,four saturated soil samples were tested by consolidation method.The results show that the desorption temperature range of the adsorbed water and its density were equal to 100−115℃and 1.30 g/cm^(3),respectively.Adsorbed water plays a positive role in keeping the compressibility of fine-grained soil at a low rate when it has high water content.Besides,adsorbed water can be a stable parameter and is difficult to discharge during the operation period of subgrade.The settlement of fine-grained soil embankment is predicted by engineering example,and compared with the result of conventional calculation method.The results show that it is more close to the field monitoring results by using the improved void ratio of soil as the parameter.
