电源控制器频率特性响应测试分析

目前电源控制器(PC U)频率响应分析主要是关注理论分析和数学模型,很少提到需要进行测试来保证系统的稳定性。频率响应特性的测试在现实产品设计、研发过程中的重要性要比理论分析重要很多。特别是对于卫星平台化的控制器控制环路的稳定性测试可以最大程度地降低系统风险。     

低轨三结砷化镓太阳电池阵遥测数据分析

针对采用三结砷化镓太阳电池阵作为主电源的低轨道卫星进行梳理,介绍了典型平台产品的技术状态。收集、整理了在轨运行时间最长的三结砷化镓太阳电池阵的在轨遥测数据,给出了其在轨温度变化曲线,分析了电性能输出及演化情况,为后续三结砷化镓太阳电池阵的应用提供了数据支持。     

电磁监测卫星太阳电池阵表面等电位控制

介绍了低轨道空间等离子体环境以及处于这种环境中的航天器太阳电池阵表面的充电特性。论述了电磁监测卫星用太阳电池阵表面等电位的控制方法,通过在玻璃盖片表面蒸镀ITO导电膜,把太阳电池阵表面的电位控制在±2 V之内。对电磁监测卫星太阳电池阵粘贴的ITO膜后的电位进行了仿真数据分析,充分证明了ITO膜对控制太阳电池阵表面电位的可行性和合理性。     

Electrochemical discharging performance of 3D porous magnesium electrode in organic electrolyte

A novel type of porous magnesium electrode with a stable 3D copper foam as current collectors for the organic magnesium-air battery was prepared by both amperostatic and pulsed electrodeposition of magnesium on copper foam substrates in an electrolyte of 1 mol/L EtMgBr/THF solution, respectively. Optimal parameters of the pulsed electrodeposition were obtained using a bending cathode at the right angle. The surface morphology of the porous electrode was investigated by SEM, and the discharging performance of the porous magnesium electrode was detected by the chronoamperometric measurement. The electrochemical stability of 3D copper foam current collectors was examined by cyclic voltammetry, SEM and ICP-OES analyses. The results show that the rate capability of the porous magnesium electrode with a stable 3D copper foam as a current collector is better than that of the planar magnesium electrode, and the rate capability of the porous magnesium electrode prepared by the pulsed electrodeposition is superior to that of the porous magnesium electrode prepared by the amperostatic electrodeposition. The 3D structure of copper foam current collectors of the porous magnesium electrode could keep stable during the discharging process.     

钠离子电池电极材料研究进展

钠是地球上储量较丰富的元素之一,与锂的化学性能类似,因此也可能适用于锂离子电池体系。钠离子电池相比锂离子电池有诸多优势,如成本低,安全性好,随着研究的深入,钠离子电池将越来越具有成本效益,并有望在未来取代锂离子电池而被广泛应用。介绍了钠离子电池正极材料、负极材料的最新研究进展,分析了该电池未来的研究发展方向。     

低温热处理对CBD-CdS薄膜性能的影响

利用化学水浴法(CBD)在玻璃衬底上制备CdS薄膜,并对其进行低温热处理,研究热处理时间和热处理温度对CdS薄膜性能的影响。研究发现,在100℃进行5 min热处理后,CdS薄膜的光学特性、晶体结构和电学性能都较热处理前得到改善,作为缓冲层材料可以很好地应用于高效铜铟镓硒(CIGS)薄膜太阳电池。     

空间用Φ50圆柱形锂离子蓄电池壳体设计

为减轻质量,空间用锂离子蓄电池壳体设计为Φ50的圆柱体,壳体材料采用铝合金,壳体各部分之间通过电子束焊连接。分析计算和强度试验结果表明,该种壳体工作时的承压安全系数不小于3.0,耐压力疲劳次数超过60 000次,新设计圆柱形锂离子蓄电池壳体力学性能可以满足空间长寿命应用的要求。     

空气电极对锂空气电池放电性能的影响

研究了GNSs(石墨烯)、Super P炭黑、VGCF(气相沉积碳纤维)等三种具有不同形貌的碳基材料对锂空气电池放电容量的影响,并以Super P炭黑为碳基材料,分别考察了碳负载量和粘结剂含量对锂空气电池放电性能的影响。为了进一步研究限制锂空气电池放电性能的因素,采用水热法合成了具有高比表面积的空心刺球状α-MnO2,制备了SuperP/α-MnO2/PVDF复合空气电极,考察了锂空气电池放电过程中的速率控制步骤。     

动力锂离子电池故障分析

在锂离子动力电池在应用过程中,充放电精度、控制策略以及电池筛选匹配方式,都会影响电池组的一致性和稳定性,导致故障的发生,针对其故障发生的特点及类型进行实验分析,通过制定相应的应对方法,提高电池组的稳定性,并提出了电池组故障预警机制,提前预估电池可能出现的故障情况,保证电池组稳定应用。     

Numerical and experimental studies on unitized regenerative proton exchange membrane fuel cell

Increasing energy need and running out of fossil-based fuels direct us to renewable energy resources. Although hydrogen is not an energy source by itself, it is an energy carrier with a high specific heat capacity. As it is used as fuel in unitized regenerative PEM fuel cells, water is separated in electrolyzer mode and stored by producing hydrogen when there is no need for energy. In this study, performance tests on the unitized regenerative PEM electrolyzer/fuel cell were carried out and numerical modelling has been performed. The validity of the developed model was confirmed by the results of the experimental study. Before starting the performance tests, the cell's leakproofness tests were carried out, and the appropriate torque force was optimized, reducing the contact resistance that causes performance loss. The material selection of the cell components and corrosion-resistant materials that can operate in both electrolyzer and fuel cell modes were preferred.In this study, 0.019 slpm of hydrogen and 0.0095 slpm of oxygen gas is produced in the electrolyzer mode, while a power density of 0.353 W/cm² is obtained in the fuel cell mode at 80 °C, from a unitized regenerative PEM fuel cell with a 5 cm² active area, whose cell elements are combined with a 3 Nm clamping torque by using 12 bolts.