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锂离子电池的高效放电能力的测量和研究

学校的机械和电子工程、华东交通大学,江西南昌330013

摘要:高速的锂电池研究对象是由于electric-chemical专家有利于提高微型化大功率设备。在本文中,测量和分析他们的高速放电性能为两种

主流的锂电池的锂聚合物电池和磷酸铁锂正极材料。结果表明:锂聚合物电池磷酸铁锂正极材料的效果比电池放电性能的恒流、功率密度和能量密度。

但是在安全方面的充放电和耐久性,磷酸铁锂正极材料具有某些优势。电池

C)2011年公布的财务有限公司选择和/或同侪检视下[CEIS 2011]责任

关键词:锂聚合物;磷酸铁锂正极材料的电池;高速排放;绩效衡量

1.引言

微电子学的发展迟缓的电子- 20世纪,小型化设备也在不断增加,越来越多的流行,这就要求非常高的功率电池, 东莞市锂电池成一个大型实际使用[1,2]。与能源短缺和全球化环境-精神压力、锂电池,现在更广泛地应用于电动汽车,卫星, 航空航天和储能等,特别是出现的电池,锂离子电池驱动的磷酸铁锂正极材料电池产业发展和应用[3 - 5]。今天,随着越来越多的形势需要支大电流电源,具有更高的性能要求一个更高的力量。现在,有一些

电池可以实现各种电流高80连续放电、大电流放电电池的性能是一个小型的研究文献[6 - 9]。摘要研究大电流放电性能分析的基础上对锂离子电池的电池放电曲线簇,

把一个代表lithium-polymer电池(脂)和磷酸铁锂正极材料电池(A123为例,研究大电流放电性能的锂电池的性能对比分析两个电池,因此,为工程实践及应用提供参考数据锂的力量。

2.电池性能的定义

在分析,首先解释执行-极佳的电池名义上。通常,锂是系列和并联使用,电池工厂性能一般额定电压及电池容量。

额定电压是指电池电压、电池容量,用C来表示,是这个数字的权力得到电池、单位或mAh啊。事实上,“C”的另一层意义用来描述能力的关系电池和贮氢合金的放电容量。例如拿5Ah的电池来说,1 C意味着5连续电流放电容量和10 C 是50,就意味着150个30度,

等等。因此,锂电池规格“C”也表示了最大输出电流

电池可以承受。有sub-rate和短期连续碳原子比名义给电池充电

执行-性能,碳原子比通常意味着连续C率。

3. LiPo电池的放电性能

有不同的定义C-rate锂电池,在这节中,解释C率基于实际测量值。

图1是一群放电曲线对韩国系列电池脂的3.7 V,5啊,25度。

在2500年采取排放中点mAh、阅读电压值。在最大额定C率(25 C), 电压值下

降了大约0.37 V比空载与价值。这个数字不包括没有- 负载电压值曲线,但我们可以推知其位置根据10 C-5C-0C价值。

图2是一个放电曲线簇国内脂电池约14.8 V,5啊,35 C。

在出院的中点处最大额定C率(35 C),电压值下降了大约1.2 V它比空载的价值,那么每个0.3 V电池。

图1 LiPo的放电曲线图2

图2是一个放电曲线簇国内脂电池约14.8 V,5啊,35 C。

在出院的中点处最大额定C率(35 C),电压值下降了大约1.2 V它比空载的价值,那么每个0.3 V电池。

图3 简单的电池模型图4 A123的放电曲线

如果电池容量是Ah,the C rate is C=I/Ah=370/(Ri*Ah)

上述方程得到Ri=370/(C*Ah)单位:mΩ

比如,5Ah,30C的电池,内部电阻应当是Ri=370/(5*30)=2.47 单位:(370≤

为multi-chip电池包的数量S系列,可以推广到以上方程

因此,一个有足够蓄电量的好电池应该满足Ri≤(370*S)/(C*Ah)

单位:mΩ(23 ℃)

我有一个重要的注温度影响产生一种强烈的内部阻力电池。脂的温度下降10度,增加内部阻力指数。在其他字,电池性能在夏天30度,有可能成为10 C在寒冷的冬天盛开。许多情况下显示脂电池,很可能在冬天的时候使用它鼓胀病,甚至不是over-discharge。原因

内部阻力增大,当温度低,这个结果的电池的保养呢

电压3.4 V /细胞原C下降速度完全放电在2.5伏特到3.0 V或甚至更少在寒冷的天气,

over-discharge受伤并导致类似。

4. A123电池的放电性能

与脂电池,A123细胞是十分简单的使用和可以快速充放电高电流。此外,加压,A123细胞分泌物作电池性能没有影响。因此,A123细胞有许多应用于工业。在这部分,笔者分析了其从两个角度性能。

第一点:恒压输出性能

A123额定电压为3.3 V电池,从而修改公式

C=I/Ah=330/(Ri*Ah)

代入原始数据有:C=330/(10*2.3)=14.3

要一个真正的原始dataIs A123 14 C电池吗? 另一个计算方法,看看放电曲线簇原来的电池显示在视图

指出剩余的90%是2.9 V空载电压,在相应的放电电流第二十五贴近。可以看出,实际的能力是2。25Ah,而C=25A/2.25Ah=11.1而实际等效的内部阻力R=(3.25V-2.7V)/(40A-1A)=14.1

Therefore, A123 is equivalent to about 11C ~ 12C battery from the similar definition of LiPo's.

第二点:无损耗的泄流能力

A123 has 70A continuous discharge capacity from the original data. Then, C = 70/2.3 = 30.4, the

age dropped is 70A × 14.1m? 1V, about 1 / 3 to no-load voltage. Self-heating power of each cell is

2 × 0.014 = 68.6W.

Therefore, excluding the voltage dropped and power loss, A123’s ulti mate discharge capacity is about

. At this time forced cooling is something we have to watch out for.

5.实验性能

A123电池实验配置

电池:2.3Ah, 3.3V A123. 8S2P, 26.4V, 4.6Ah, 8S2P意味着在系列里有八节电池,然后分2列平行置于于外表面。重量为1228g,体积为788cm3。负载:最大功率为3000W的无刷电机。价格:二手电池每节为12元,新电池每节120元。锂聚合物电池实验配置

电池:2.6Ah,3.7V,放电效率为25C的锂聚合物电池(品牌省略),并且已经经过了10次的充电-放电循环。6S2P,22.2V,5.2Ah。重量为792g体积为406 cm3。

负载:最大功率为3000W的无刷电机。价格:6S1P,2.6Ah,25C的锂聚合物电池大概为500元。

使用鹰树电子记录检测器来收集电压和电流的数据,以10点/秒的电压记录样品速率,如图5和图6所示。

图5(a)放电曲线图图5(b) 当前最大电流

图6(a)放电曲线图图6(b)当前最大电流

通过对这些图的比较我们可以发现:

(1)由最大值可以看出这2种电池的最大电流和最大功率相同,但是从电压方面可以看出很大的不同。

(2)在最大电流值那一点,释放的电流最大可达到120A。A123电池降了大约6V的电流,而锂离子聚合物电池则降了大概3V。(3)在高负荷实验之后,A123电池组有一个缓慢的恢复过程。

(4)电池的内阻可以由图中的数据计算出来,

A123电池如图5(b)所示,当电压降为6.2V电流为120A时,内阻R=51.7mΩ,转化为每节电池,内阻r=12.9 mΩ。锂离子聚合物电池如图6(b)所示,当电压降为3.0V电流为118A时,内阻R=25.4 mΩ,转化为每节电池,内阻r=8.47 m Ω。

因此,我们得到了如下数据:

功率/质量密度:A123=1.94KW/kg LiPo=2.91KW/kg

能量/质量密度:A123=98.9Wh/kg LiPo= Wh/kg

功率/体积密度:A123=3.03W/ cm3 LiPo=5.67 W/ cm3

能量/体积密度:A123=0.154Wh/ cm3 LiPo=0.284 Wh/ cm3

经济:二手A123=1.58元/ Wh 新A123=15.8元/ Wh LiPo=8.66元/ Wh 6.结论和讨论

(1)A123电池的总电阻几乎比LiPo的2倍还多,但是2种电池的输出功率相似。原因是A123电池装成了8节,总电压比LiPo电池高,这补偿了部分A123电池因大幅电压下降而造成的功率损失。

(2)考虑到2种电池的能力不同,7~8节A123电池的功率密度与6节25C的LiPo电池一样。A123电池的超负荷电流,超负荷充电和超负荷放电能力比LiPo 电池更高。A123电池的功率密度和能量密度更低,大概是同质量25C速率LiPo 电池的2/3。另外,体积相同时,A123电池的功率密度和能量密度只有25C速率LiPo电池的1/2。

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上海历届春高考英语句子翻译汇编(2000年-----2016年) 2000上海春考 1. 进入大学以后, 他对计算机很感兴趣。(become interested in) He became very interested in computers after he entered college. 2. 集邮几乎占据了他所有业余时间。(occupy) Collecting stamps occupies almost all his spare time. 3. 只要专心学习, 你一定能顺利通过考试。(concentrate) As long as you concentrate on your study, you are sure to pass the exam. 4. 越来越多的人意识到遵守交通规则的重要性。(be aware) More and more people are aware of the importance of observing traffic regulations. 5. 尽管有很多困难, 我们仍将努力执行我们的计划。(in spite of) In spite of many difficulties/hardships, we will still carry out our plan. 6. 诺贝尔奖金授予那些在某一个领域作出巨大贡献的科学家。(be awarded) The Nobel Prizes are awarded to those scientists who have made great contributions i n a certain field. 2000上海高考 1. 这张照片是我想起了我们在夏令营度过的日子。(remind) This picture reminds me of the days that we spent in the summer camp. 2. 假如你想从事这项工作,你必须先接受三个月的训练。(take up) If you want to take up this job, you must first receive three months’ training. 3. 你一旦养成了坏习惯,改掉它是很难的。(once) Once you develop a bad habit, it is difficult to get rid of it. 4. 同其他同学相比,那个女孩有更强的英语听,说能力。(compare) Compared with other students, the girl has better listening and speaking skills. 5. 众所周知,成功来自于勤奋,不努力则一事无成。(without) As is known to all, success comes from hard work/diligence, and nothing can be achie ved without efforts/hard work.

大数据时代英文翻译

Era of Big Data is a woman's age; women in the gene can accumulate and deal with big data/ women are born to accumulate and deal with big data. Many men and children, in fact, have been wondering about this special ability of women. Like, as a child, just as soon as you entered the house your Mother said immediately in a suspicious tone: “Liu zhijun, you didn’t do well in the exam today, did you.” Another example, you just have a glance at the mobile phone, your wife laughs: “Does Er gou the next door ask you to play games?” One more ex ample, when you close the door and make a phone call, your girlfriend will cry: “Who are shot in bed?” They are sometimes right, sometimes wrong. However, On the whole, the accuracy rate is higher than chance level. When they are wrong, men would sneer women always give way to foolish fancies; when they are right, men would say women are sensitive animal maybe with more acute sensory organs. Anyway, that is a guess. It has already scared man that overall accuracy rate is higher than the random level. In order to adapt to this point, the male also developed a very strong skills against reconnaissance. This part is beyond the scope of this article, so no more details about it. Some studies, such as Hanna Holmes’s paper, have indi cated that the white matter of the female’s brain is higher than that of the male. So they have very strong imagination of connecting things together. Some recent studies have shown that women are better than men in the "date" memory. That is the reason why they are able to remember all the birthdays, anniversaries, and even some of the great day of unimportant friends. No matter whether these results are true or not, I am afraid that this is not women's most outstanding ability. Women's most remarkable ability is a long-term tracking of some seemingly unimportant data to form their own baseline and pattern. Once the patterns of these data points are significantly different from the baseline she is familiar with, she knows something unusual. In their daily life, women do not consider the difference between causality and correlation. They believe in the principle: "There must be something wrong out of something unusual." People who talk about big data often take Lin Biao as an example. Lin Biao recorded some detailed and unimportant data after a battle. Such as seized guns, the proportion of rifles and pistols, the age levels of war prisoners, seized grain, whether they are sorghum or millet, etc., all of which were unavoidably recorded in the book. Others laughed at him. But later, he determined where the enemy headquarters were according to these data. What women do is almost the same. A girl A has a secret crush on boy B, but she usually doesn’t contact him directly. Two days later, I asked her if she wanted to ask him to have dinner together. She said he was playing. I wondered “how do you know that?” She said that boy B usually is on the line Gmail at 8:00 am, away status at8:30am, for he goes out to buy coffee and breakfast, on line again at 9:00am, busy status, for he is at work, away again at12:30am for lunch, on line for whole evenings, maybe for reading or playing games. His buddy C is on line at10:00 am, still online till 2:00am next day. He is a boy who gets up late and stays up late. His buddy D is on line for the most of the day. However, the most important pattern is that there are 2-3 days per week, during which they would be offline or away for 3-4 hours together. Conclusion: they are playing together.

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