摘要:锂电池组串联充、放电，应确保每个电池的均衡，不然会在使用过程中影响电池的使用寿命和性能。现有的蓄电池多采用串联，由于电池组在制造时不可能保证各单体电池初始容量、电压或内阻等方面完全相等，在使用过程中，势必会造成某些单体电池的过充电或过放电现象。当某个单体电池电压低了，没有了放电的能力，那么它就变成了一个用电器，其他的串联的电池就会对它充电，会使整个电池组不能正常工作。同时也会减少电池的使用寿命。因此电池组在工作工程中，电池间的不均衡性是导致电池不能正常工作的比较重要的因素，所以对电池组进行均衡控制是很有必要的。本文针对8节锂离子电池组均衡控制进行了均衡电路的设计，分析了现有的电池组均衡方案的不足之处，提出了一种简单高效的低功耗的均衡方案，该方案的LTC6802-2芯片能自动实现电池间的均衡控制，减小了不一致性，提高了电池的使用寿命。仿真实验验证了该设计的正确性。23827
毕业论文关键词： AVR；锂电池；均衡电路；
Lithium-ion battery equalization circuit design of the AVR-based
Abstract: Lithium series battery charge and discharge, should ensure that each battery equalization, the properties and service life or will influence in the process of using the battery. The existing storage battery are connected in series, because the battery may not guarantee each monomer battery initial capacity, voltage or resistance completely equal at the time of manufacture, in use process, it is bound to cause some single battery overcharge or over discharge phenomenon. When a single battery voltage is low, no discharge capacity, it becomes a appliances, other series battery will charge it, will make the battery can not work normally. At the same time also can reduce the battery life. So the battery in the work of engineering, the imbalance between the battery is an important factor causing the battery can not work normally, so the battery pack balancing control is necessary. In this paper, the design of equalization circuit for 8 lithium ion battery equalization control, analyses the shortcomings of existing battery equalization scheme proposed balancing scheme, a low power LTC6802-2 chip is simple and efficient, the program can automatically realize the balance control between the cells, reduce the inconsistency, improve battery life. Simulation results verify the correctness of the design.
Key words: AVR; Lithium batteries; equalization circuit;
目录
1 绪论    1
1.1 本课题研究的意义    1
1.2 国内外发展现状    1
1.3 本课题的工作及主要内容    2
2影响锂离子电池不均衡的原因和要素    3
2.1 造成锂离子电池不均衡的原因    3
3 锂离子电池均衡电路    4
3.1 均衡电路    4
3.2 均衡系统作用    4
3.3 均衡系统分类    4
3.4 均衡系统控制原理    5
3.4.1 耗散型均衡    5
3.4.2 非耗散型均衡    6
3.4.3 分布式均衡    8
3.4.4 集中式均衡    9
3.5 均衡电路方法比较    10
4 基于LTC6802和AVR单片机的均衡电路    11
4.1 LTC6802-2介绍    11
4.2 AVR ATmega8单片机简介    11
4.3 基于LTC6802和AVR单片机的均衡电路设计    13
4.3.1电源电路    13
4.3.2 串口电路    15
4.3.3 晶振电路    16
4.3.4 均衡电路    17
4.3.5控制电路    18
4.3.6 隔离电路    19 基于AVR单片机的锂离子电池均衡电路的设计:http://www.751com.cn/zidonghua/lunwen_17062.html