Advanced Materials Research Vols. 608-609

Abstract: This paper introduce the working principle and classification of air source heat pump water heater. Thermodynamic calculation of the air source heat pump water heater is carried out, such as air source heat pump water heating coefficient, energy saving effect, and the cooling effect of the surrounding environment, and primary energy utilization of heating conditions of several forms. The primary energy utilization rate of air source heat pump water heater is the highest, and showing a good energy-saving.

Abstract: The groundwater source heat pump (GWHP) system utilizes groundwater as alternative renewable and clean energy source for space heating and cooling, withdraws water from a production well, passes it through a heat exchanger and discharges the water into an injection well. Hebei Province of China is rich of geothermal resources; there are suitable hydrogeological conditions in most areas. Take an office building in Hebei Province for example; a detail loads analysis of the groundwater source heat pump system was conducted. At the same time, an analysis of environmental energy benefits was also conducted. Comparing with the traditional systems for heating and cooling, groundwater source heat pump heating and cooling works well, with significant energy and environmental benefits, should be widely used.

Abstract: The Battery Management System (BMS) is provided to manage battery packs and interface with other systems which require information of charging state. It designed and developed a simulated system of BMS which can communicate with the Electric Vehicle (EV) off-board charger via the SAE J1939 protocol. The system could build different battery models based on corresponding electrical parameters such as battery type, charging mode, nominal voltage, etc. It was applied in the protocol conformance testing through which to verify whether the design of off-board charger was conform to protocol specifications. The results show that the system runs well and reliable, greatly improves the development and test efficiency of off-board charger.

Abstract: Li-ion batteries have been widely used to power portable electronic equipments, and have been considered as an alternative source of power for electric or hybrid vehicles. Cathode is a key part of Li-ion battery and determines the battery performance. In this paper, we briefly introduced an important and promising Li-Ni-Co-Mn-O cathode with high capacity and working voltage. The development status, modification methods, and existent issues of Li-Ni-Co-Mn-O cathode were also introduced. And in the end, we propose a possible solution to the issues blocking in application processes.

Abstract: The chemistry system with negative graphite felt electrode and a single electrolyte, lead(II)in methanesulfonic acid, was described. The effects of treatment methods on kinetics and cyclic voltammetry behavior of Pb(II)/Pb couple were studied. The results show that the equilibrium electrode potential Pb(II)/Pb couple was -0.233V and the Pb(II)/Pb couple on graphite felt electrode had a good kinetics behavior. The cyclic voltammogram of graphite felt electrode showed that the oxidization and reduction peak potentials were -0.044V and -0.454V, respectively. The graphite felt treated with methanesulfonic acid had little oxidization and reduction peak potentials difference, and showed good electro-catalytic activity for Pb(II)/Pb couple.

Abstract: A novel method was showed to the preparation of zinc electrodes with step heat. The process is not only simple for the preparation of electrodes, but also better for the performance. Zinc nitrate and calcium nitrate were selected as raw materials for preparing calcium zincate electrodes. Preparation of zinc electrodes under different conditions were studied and compared. The results shows that the performance of a battery which is composed of electrodes with step heat can meet the requirements for high power zinc-nickel batteries.

Abstract: Analysis of harmonic generation and hazards of electric vehicle charging/ battery swap station, suitable harmonic control method was proposed. Introduced new low-harmonic charger applications, the calculation of the harmonic content, the harmonic treatment data analysis.

Abstract: In this paper, the characteristics and applications of various battery energy storage systems (BESS) are compared. The lead acid batteries are emphatically summarized, involving categories, principles and critical techniques. According to the running condition and performance needs of energy storage in renewable energy power generation system, appropriate lead acid battery is selected. The energy storage system control method based on low-pass filter is systematically expatiated. Finally, the deployment of energy storage in micro-grid is also calculated by supplying reliable power for the consumer within certain time.

Abstract: The effects of impurity, temperature, concentration of vanadium and sulphuric acid on the stability of electrolyte in vanadium redox flow batteries are studied. It is found that the sediment at positive electrodes is V₂O₅﹒1.6H₂O , and the sediment at negative electrodes is V₂(SO₄)₃﹒10H₂O. Although impurities influence the stability of vanadium electrolyte to some extent, the matching relationship between the vanadium and H₂SO₄ concentration is more important . To avoid the sensitivity of vanadium electrolyte to impurities, the concentration of H₂SO₄ should be raised to a certain extent to confirm the stability of positive electrolyte. At the same time, a moderate vanadium concentration should be employed to assure the stability of negative electrolyte. From the viewpoint of increased stability , the prefered vanadium electrolyte composition is 1.5-1.6 M vanadium in 4-5M H₂SO₄ medium at temperature above -10°C besides the electrolyte with relatively high purity.

Abstract: Based on the characteristics of power Li-ion battery, a distributed battery management system (BMS) is designed and implemented for electric vehicle (EV), which is composed of a master system and several measurement modules. The measurement modules are embedded into various numbers of cells and detect the status information of the battery. The system structure is highly flexible and reliable. The testing results of this BMS with a battery charge and discharge test equipment show that it can measure and display the status information of the battery precisely and reliably with a flexible structure, which supports EVs running safely and reliably.