The expanding market of new energy vehicles has raised an urgent demand for battery safety. As a crucial component of pouch batteries, the performance of aluminum-plastic film directly impacts the overall safety of the battery. This paper conducts a macro-level study on the mechanical performance of aluminum-plastic film and presents a comprehensive modeling method for simulating the film's behavior. Since aluminum-plastic film is a thin membrane material, conventional methods for measuring material fracture parameters are not applicable. To address this issue, the paper designs a series of experiments using simulation techniques and obtains calibrated parameters for the ductile fracture criterion of the aluminum-plastic film. Consequently, a simulation model is developed to accurately represent the fracture characteristics. The simulation results effectively reflect the actual mechanical properties and fracture behavior of the aluminum-plastic film.
In this paper, a two-stage equalization topology based on Zero-Voltage Switching Quasi-Resonant Converter (ZVS QRC) is proposed to solve the problems of long equalization time and low energy utilization of series lithium-ion battery packs. The equalization topology is divided into two forms: intra-group and inter-group, ZVS QRCs are adopted in both intra-group and inter-group, which can equalize any single cell within a group, and the equalization circuit within each pack can equalize simultaneously, which greatly reduces the equalization time, and reduces the switching loss during the equalization process by introducing quasi-resonant circuit to improve the energy utilization. Taking the State of Charge (SOC) as the equalization target, a group equalization strategy based on the Credibility Factor (C-F) inference model is proposed. The strategy defines the SOC unbalance degree of a single battery, gets the group unbalance degree according to the C-F inference model, and gets the group equalization state from the unbalance degree, to control the group for equalization. Matlab/Simulink software is used to build the model and simulate it. The experimental results demonstrate that the proposed topology saves approximately 25% of the equalization time compared to the traditional Buck-Boost group equalization topology. Under the same static and charge/discharge conditions, the equalization time is reduced by about 21% and the energy utilization is improved by about 6% after using the C-F inference model for equalization compared to the fixed-threshold method.
针对某基于蛇形通道液冷电池热管理系统,10个蛇形通道入口流速相等所导致的电池组温度分布一致性差的问题,提出了一种全新的蛇形通道分组变流速优化方案.建立了电池组的三维热模型,对各组不同入口流速下电池组散热性能进行了数值研究.结果表明:在通道1与10划分为组M1,通道2～3、8～9划分为组M2,通道4～7划分为组M3的分组下,组M1、M2、M3通道入口流速比n分别为0.4、1.8、2.0时,电池模组内单体电池间最大温度差由2.47 K降低到0.24 K,温度一致性显著提高,电池组最高温度由308.78 K降低到307.86 K,电池热管理系统散热性能得到有效改善;冷板厚度增加对提高电池热管理系统散热性能的贡献较小,电池-冷板接触面平均温度最大降幅仅为0.16 K,同时使电池热管理系统体积增大,说明在对电池热管理系统散热性能优化时,应优先考虑对冷却通道进行分组变流量设计.
近几年卫星在轨出现多次太阳电池阵输出电流减小的异常问题,通过对在轨数据的分析确认是近期频繁高发的同一类型质量问题,主要由于一段时间技术、工艺条件发生变化,而地面试验验证手段没有适应该变化,导致出现异常.针对卫星太阳电池阵研制标准及其验证试验开展研究,对国外卫星太阳电池阵在研制阶段完成的试验进行分析.重点研究太阳电池片的生产、鉴定测试和试验;太阳电池板的生产和鉴定过程中完成的测试和试验;以及对太阳电池板装配成翼后进行的测试和试验验证体系进行调研与分析研究,并与国内卫星太阳电池阵研制过程的各项试验开展对比分析,为后续太阳电池阵的研制过程试验提供参考.
以多孔碳为载体负载单质硫作为正极材料对提高锌硫电池的电荷存储能力具有重要的研究价值.以柠檬酸钾钠为前驱体直接碳化得到具有高比表面积破裂的碳纳米笼(BPCs),并以此为载体,通过熔融渗透法使单质硫均匀负载于BPCs的孔隙结构中制备出BPCs-S作为Zn-S电池正极材料.BPCs的孔隙结构可以对硫单质起到吸附作用,同时在电池反应中对正极膨胀起到支撑作用,提高硫的利用率.通过非原位XRD分析验证了转换机制的存在.
