直接甲醇燃料电池双极板的研究进展

作为直接甲醇燃料电池的关键部件之一,双极板主要起分配燃料和收集电流的作用,其直接影响燃料电池的性能和成本.介绍了目前国内外双极板的研究现状及进展.     

质子交换膜燃料电池研究进展

质子交换膜燃料电池具有高效环保、经济安全、比能量和比功率高、启动快、寿命长等优点,受到各国政府和大公司的广泛关注。文章介绍了质子交换膜、电催化剂、电极、双极板和储氢技术等关键材料和部件的研究现状。开发合适、廉价的催化剂及质子交换膜、优化电极结构、选择合适的双极板材料并批量生产以及发展大规模实用的储氢技术等是质子交换膜燃料电池今后研究的重点和方向。     

双极天线的核电磁脉冲响应特性研究*

针对应用较为广泛的一种短波双极天线,利用CST 仿真分析了天线对高空核电磁脉冲(HEMP)的响应特性。计算了双极天线分别在自由空间和导体板上方时的天线端口开路及端接50 赘负载情况下的响应特性,得出了天线在两种情况下端口的感应电压时域和频域信号及负载的沉积能量,并探讨了其随电磁脉冲入射角兹、导体板半径R 和天线高度H 的变化规律。仿真结果对于实验方案的制定及天线系统防护具有重要指导意义。     

燃料电池车用大功率DC／DC变换器电磁兼容性研究

本文对燃料电池电动汽车用大功率DC/DC变换器的电磁干扰源及传输途径进行深入分析,从抑制大功率DC/DC变换器的电磁干扰、控制电路PCB板信号隔离以及软件程序抗干扰三个方面进行大功率DC/DC变换器的电磁兼容性研究,给出抑制燃料电池电动汽车用大功率DC/DC变换器电磁干扰以及提高控制电路板及软件程序抗干扰能力的具体措施,为整车的可靠运行提供了保障.     

MOS/双极高压复合结构中可控硅效应的抑制

本文研究和分析具有偏置栅又有延伸源场板的MOS和双极型高压复合结构中产生可控硅效应的机理,提出如何从材料、几何结构和工艺参数方面采取措施抑制和防止可控硅效应的产生.     

Diodes推出适用于超便携式电子产品的小型SOT963封装器件

Diodes公司推出采用超小型SOT963封装的双极晶体管（BJT）、MOSFET和瞬态抑制二极管（TVS）器件,性能可媲美甚至超过采用更大封装的器件。Diodes SOT963的占板面积仅有0.7mm2,比SOT723封装少30%,     

“电路与电子线路基础”课程教学博物实验板

本文介绍用于"电路与电子线路基础"课程教学的两套博物实验板。第一套与电路部分课程匹配,包含电池、电阻、电容、电感和变压器、传输线和滤波器;第二套与电子线路部分课程匹配,包含二极管、双极型晶体管、场效应晶体管、运算放大器、功率放大器和振荡器。这两套教学博物实验板与ADI公司的USB接口模拟测试模块相结合,可在课堂上实现电路功能原理的测试和验证,有效提高教学质量。     

测量技术与设备

0531601石墨板-碳纸接触电阻的测量[刊,中]/王文增//电源技术.—2005,29(9).—599-601(D2)接触电阻是表征双极板性能的重要参数,然而由于接触电阻难于直接测量,许多研究中仅限于测量体积电阻,即本体电阻和接触电阻之和。通过电导池法测量得到双极板的本体电阻,而通过铜电极法得到了     

基于硅的微型燃料电池的研究

介绍了基于硅的微型燃料电池的国内外研究动态，总结了微型燃料电池的研究成果，并对其制作方法中的关键技术进行了阐述。在此基础上，根据微通道的特性，分析了电极板上各种不同截面形状的气道对微型燃料电池性能的影响。当由气道决定的水力直径Dh由大变小时，在同样的实验条件下，电池性能开始逐渐变好，达到一个最佳值后，性能又逐渐下降。     

一种新型电源--燃料电池

首先介绍燃料电池的类型并比较各类燃料电池的优缺点,之后重点阐明质子交换膜燃料电池（PEMFC）的结构和基本工作原理,再通过燃料电池发电系统供电方式,讨论燃料电池在通信电源系统中的应用和发展趋势.     

Auslegung eines 1-MW-Brennstoffzellen-Heizkraftwerks

Based on the feasibility study ?1,5-MW-PAFC-Heizkraftwerk” GEW intends to integrate a 1 MW fuel cell plant for the combined heat and power production (CHP) in the district heating network in Köln-Merheim. Together with an American fuel cell manufacturer the technical feasibility is being examined. In the MW range it would be the first fuel cell in Europe working under atmospheric pressure.     

基于BQ24610的质子膜燃料电池应急供电系统

设计了一种基于BQ24610的质子膜燃料电池(PEMFC)和锂聚合物电池混合供电的100W应急供电系统.系统由质子膜燃料电池、燃料电池控制器、锂电池充电管理、锂聚合物电池和系统控制器组成.并实际制作了样机,测试系统各项数据和指标,均达到预期目标,取得了良好的社会效益和经济效益.     

质子交换膜燃料电池的垫片机械性能研究

为了将石墨复合材料用于燃料电池的双极板材料中,研究了湿度环境对双极板力学性能的影响。制造了两种类型的样品,对两种样品进行了一系列的实验：吸水率、弯曲和拉伸试验的强度和模量。结果表明,添加石墨复合材料的试样吸水率低于没有石墨/环氧复合材料碳纤维织物的试样,所以有碳纤维织物试样的总吸水率较低。两种试样的弯曲强度和模量均会下降。另外在石墨-颗粒/环氧复合材料中加入碳纤维织物能够显著提高了拉伸强度。     

燃料电池蓄电池混合供电系统

燃料电池是一种清洁、环保的可替代能源,但昂贵的价格限制了其推广。本文结合燃料电池、蓄电池的优点,提出燃料电池与蓄电池混合供电方式,降低系统成本。为了减小输入电流纹波延长电池使用寿命,变换器均采取交错并联拓扑。文中详细分析了系统工作原理及其控制方式,仿真结果验证了系统设计方案的可行性。     

Development and Future Issues of High Voltage Systems for FCV

Nissan Motor Co., Ltd, has delivered the New X-TRAIL FCV 2005 Year Model to customers in April 2006 in Japan, in which a newly developed in-house fuel cell stack and 70-MPa high-pressure hydrogen storage system are installed. For fuel cell vehicles, not only the fuel cell system and the hydrogen storage system but also the high-voltage system is very important, such as a traction motor to propel the vehicle, motors that drive some devices for the fuel cell system, a second battery that stores braking energy and assists the acceleration, inverters which supply alternating current to the prescribed motors, and converters which change voltage generated by the fuel cell stack to the specific level for each subsystems to operate. X-TRAIL FCV 2005MY has increased the performance of driving range and acceleration compared to 2003MY. We have practiced using new technologies to reduce the size reduction of the high-voltage system to achieve these performance improvements, but it still needs many improvements to make fuel cell vehicles popular to the market     

A bond graph model-based evaluation of a control scheme to improve the dynamic performance of a solid oxide fuel cell

A control strategy for a solid oxide fuel cell (SOFC) is developed in this paper to maintain required cell operating conditions while ensuring good fuel efficiency and satisfying the constraints on the transient performance. To verify the controller performance, a zero-dimensional true bond graph model of an SOFC system is developed which makes use of a C-field for two gas species in order to model the cathode and anode channel gases. Moreover, an existing R-field model has been extended for modeling of forced convection of a mixture of two gas species. The coupling between the chemical, thermal, mechanical and the hydraulic domains, which is encountered in a fuel cell system, is represented in a unified manner by using true bond graphs. The fuel utilization (FU) and the air utilization (AU) are interpreted in terms of the partial pressures of the gases. The static characteristics of the fuel cell obtained are in good agreement with the data from the literature. The dynamic response of the fuel cell to step changes in load current is obtained. From the simulations it is shown that all the control objectives are achieved by the proposed control system.     

MEMS微型燃料电池及其基于压电风扇的换气方法

介绍了基于MEMS的微型燃料电池的国内外研究动态 ,对其技术关键进行了阐述。在此基础上 ,对微型燃料电池的换气方法进行了研究。提出一种低功耗、体积小的压电风扇 ,对其力学模型进行了分析 ,并进行了风速、振幅、功耗等方面的实验研究 ,初步证明其应用于微型燃料电池换气的可行性     

燃料电池在通信电源中的应用

介绍了一种新能源装置——燃料电池的原理、分类、特性及其在通信电源中的应用,并将其与柴油发电机组、铅酸蓄电池在能量转换效率、环境兼容性、可靠性、成本等诸多方面进行了比较,分析了燃料电池在通信行业中的应用现状以及存在的问题,并对燃料电池在通信行业中的应用前景进行了展望。     

Fuel cells to the fore [electric vehicles]

Long regarded as a far-future technology, proton exchange membrane (PEM) hydrogen fuel-cell systems have be more compact and may well finesse the battery problem in electric vehicles. PEM fuel cells operating at about 80°C and employing a thin plastic sheet as their electrolyte, are easy and safe to handle in manufacturing and in later use. Unlike some other electrolytes, their solid plastic membrane can tolerate a modest pressure differential across the cell, making for easy pressurization, which increases power density, simplifies the rest of the system, and reduces cost. A PEM fuel cell is an energy-conversion, not an energy-storage, device. It converts a fuel's chemical energy into electricity directly-that is, electrochemically, with no intermediate thermal or mechanical processes such as occur when a generator is driven by an internal combustion engine. Consequently, the energy conversion is an efficient 50 percent or so, and is clean, its only byproducts being heat and water. The fuel cell will continue to supply electrical power indefinitely, as long as it is supplied with hydrogen and oxygen. The cell itself does not discharge or find its energy depleted, as a battery does. In a car powered by a fuel cell, the storage function is performed by a fuel tank, as in conventional vehicles