锂离子电池组管理系统研究
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摘要
随着大型锂离子电池组的模块化以及中型锂离子电池组的广泛应用,电池组的循环性能和安全性能问题成为了当前制约发展的主要因素。而管理电路可缓解这些问题,因此电池组管理系统的研究已成为当前的热点。
     本文对锂离子电池组管理系统进行了研究,主要从电量管理系统、状态管理系统以及均衡管理系统方面进行了研究,增强了循环中电池组的安全性能及提高了电池组的循环寿命。
     对电流采样精度以及电量计量算法进行了研究,在电量计量算法校正中加入了随着循环的自适应校正,改善了循环后期电量计量精度低的问题,计量误差小于5%。
     对管理系统的低功耗进行了研究,通过单电源设计等使管理系统整体功耗为200mW左右。通过算法,实现了电池组循环寿命的精确计量,并以此为基础对电量计量模块以及均衡控制模块进行自适应校正,实现了管理系统各模块的有机结合。
     对电压检测电路对电池组一致性的影响进行了研究,电压检测电路对一致性有着重要的影响,设计了实用的电压检测电路减少了这种影响。结合实验对影响电池组循环寿命的因素进行了研究,研究表明过充电、过放电、温度差异及充电倍率差异是导致单体电池循环寿命快速衰减的原因。并对电池组的循环寿命进行了研究,结果表明经过筛选后的单体电池组合后,在仅有保护的管理系统情况下,循环寿命在220次。而结合了单片机系统,采用了新的均衡控制策略,缓解了电池组中最差性能电池的加速衰减,从而改善了电池组的循环寿命,达到1000次以上。
     对管理系统的可靠性和抗干扰能力进行了研究,通过硬件电路和软件优化设计提高了系统的可靠性。
With the modularization of the large-sized Li-ion batteries and the widely used of the middle-sized batteries, the cycle life and safety capability of Li-ion batteries have become the primary problems to hinder development. Currently the battery management system (BMS) was focused in the study for its mitigating the adverse effect of these problems.
     The BMS, including the electric quantity gauge system, the status management system and the balance control system, was studied in this paper, and the safety capability of the Li-ion batteries was improved and the cycle life of the Li-ion batteries was prolonged.
     The investigation on the accuracy of current sample and the gauge arithmetic indicated that the gauge accuracy especially at the end of the cycle life was kept within 5% by the adaptive modification of the cycle life.
     The research of low power dissipation of the BMS showed that the power dissipation was around 200mW by circuit optimization such as single-power-supply. The cycle life was gauged accurately by the arithmetic, the electric quantity gauge system and the balance control system was adaptive modification of the cycle life, each module of BMS was organically combinated.
     The study of the consistency of the batteries revealed that the effect of voltage measurement circuit on the consistency of the Li-ion batteries was obvious, and a novel voltage measurement circuit was designed to decrease the adverse effect. The investigation on the factors which caused the Li-ion batteries to deteriorate acutely demonstrated that overcharge, over-discharge, temperature difference and charge ratio difference were the most reasons which caused the battery worsened. The cycle capability of the Li-ion batteries was studied, and the experiment indicated that the cycle life of filtered batteries with protection was only around 220, while the cycle life of the unfiltered batteries with BMS of novel control strategy which mitigated the acute deterioration of the worst battery was above 1000.
     The reliability and the anti-jamming of the BMS was studied, the reliability of the system was improved by the optimization of the hardware and software design.
引文
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