【摘要】：隨著人們環(huán)保意識的提高,鋰電池以其優(yōu)越的性能迅速出現(xiàn)在人們生活的方方面面,同時越來越廣泛的應用對電池管理系統(tǒng)的要求也越來越高。由于生產(chǎn)工藝的限制及使用環(huán)境的影響,電池組中各單體電池的不一致性成為限制鋰電池應用的關(guān)鍵因素,因此均衡控制成為電池管理系統(tǒng)研究的一個重點以及難點。本文針對主動均衡系統(tǒng)展開了深入的研究。首先本文分析了已經(jīng)出現(xiàn)的各種均衡方式,設計了一種分層的均衡拓撲結(jié)構(gòu)。底層基于Buck-Boost電路提出了一種改進的結(jié)構(gòu),增加了一個均衡橋臂,并且采用耦合電感作為能量轉(zhuǎn)移器件,大大減小了電流的脈動。而頂層采用反激式變壓器的結(jié)構(gòu),使能量可以從單體電池轉(zhuǎn)移到電池組,也可以從電池組轉(zhuǎn)移到單體電池,提高了均衡效率。這種結(jié)構(gòu)也增加了可均衡的單體電池的數(shù)量,可用于大功率電池組。其次針對控制策略進行了研究,分析了開路電壓與SOC的關(guān)系,利用曲線擬合快速得到開路電壓,從而使利用開路電壓進行均衡控制成為可能。然后分析了模糊控制策略,進行了程序流程圖的設計,接下來在Simulink環(huán)境下搭建仿真模型,驗證設計的正確性。最后在仿真的基礎上進行實驗平臺的搭建,進一步驗證該設計的合理性。實驗結(jié)果表明,本文設計的均衡電路對整個鋰電池組的均衡起到了很好的效果,增大了均衡電流,減小了電路損耗,最終使各個單體趨于一致,改善了電池組的性能。
[Abstract]:With the improvement of people's awareness of environmental protection, lithium battery has rapidly appeared in all aspects of people's life because of its superior performance. At the same time, more and more extensive application of the battery management system is also becoming more and more demanding. Due to the limitation of the production process and the influence of the environment, the inconsistency of the individual cells in the battery pack becomes the key factor to restrict the application of lithium battery, so the balance control becomes an important and difficult point in the research of the battery management system. In this paper, the active equalization system is studied deeply. First of all, this paper analyzes the existing equalization methods and designs a hierarchical equilibrium topology. An improved structure based on Buck-Boost circuit is proposed in the bottom layer. An equalization bridge arm is added and the coupling inductor is used as the energy transfer device, which greatly reduces the current pulsation. The structure of flyback transformer in the top layer can transfer energy from the single cell to the battery pack or from the battery pack to the single cell so that the equalization efficiency is improved. This structure also increases the number of balanced single-cell cells that can be used in high-power batteries. Secondly, the control strategy is studied, the relationship between open circuit voltage and SOC is analyzed, and the open circuit voltage is obtained quickly by curve fitting, which makes it possible to use open circuit voltage to equalize control. Then the fuzzy control strategy is analyzed and the program flow chart is designed. Then the simulation model is built in Simulink environment to verify the correctness of the design. Finally, the experiment platform is built on the basis of simulation to further verify the rationality of the design. The experimental results show that the equalization circuit designed in this paper has a good effect on the equalization of the whole lithium battery pack, increases the equalization current, reduces the circuit loss, and finally makes the monomer tend to be consistent, and improves the performance of the battery pack.
【學位授予單位】：河南科技大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TM912

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本文編號：2131166