【摘要】：鉛酸蓄電池在混合電動車使用過程中,負(fù)極表面容易硫酸鹽化,導(dǎo)致電解液無法擴(kuò)散至極板內(nèi)部,使電池失效。通過在負(fù)極中加入碳添加劑能有效抑制負(fù)極板硫酸鹽化。本文主要研究了不同種類的碳材料對電池的充電接受能力,在常溫和低溫下的不同倍率放電性能以及電池在HRPSoC下循環(huán)壽命的影響。得到以下結(jié)論：本文選用了四種碳材料：炭黑、膨脹石墨、鱗片石墨、膠體石墨。通過測試不同含碳鉛粉的電導(dǎo)率,研究不同碳對極板電導(dǎo)率的影響。結(jié)果表明：碳材料改善極板電導(dǎo)率的能力大小為：炭黑鱗片石墨膨脹石墨膠體石墨。通過在負(fù)極板中添加不同種類不同比例的碳材料,進(jìn)行充電性能測試,研究不同碳對電池充電接受能力的影響。結(jié)果表明：負(fù)極板炭黑含量較少時(shí),最有利于改善電池充電性能；而石墨類碳材料含量較大時(shí)才能更好地改善電池充電性能。將充足電的電池分別在25℃下進(jìn)行2h率、2C放電測試以及在O-C下進(jìn)行1C、2C放電測試,研究不同碳添加劑對電池在常溫、低溫下不同倍率放電性能的影響。結(jié)果表明：負(fù)極板中分別添加一定量的炭黑、膨脹石墨、鱗片石墨、膠體石墨,電池在常溫下的2h率及2C率放電容量最大提升幅度分別為18.2%、22.5%、11.1%、6.85%和28.4%、29.0%、30.9%、19.5%。在低溫下,過多的碳材料反而會使活性物質(zhì)的孔徑變小,不利于電解液的擴(kuò)散。結(jié)果表明：負(fù)極板中添加炭黑、膨脹石墨、鱗片石墨、膠體石墨,電池在低溫下的1C、2C放電容量最大提升幅度分別為23.6%、21.3%、33.0%、23.5%和26.1%、25.9%、20.7%、21.5%。將含不同碳的電池進(jìn)行HRPSoC循環(huán)測試,研究不同碳對電池在HRPSoC下循環(huán)性能的影響。結(jié)果表明：負(fù)極板中添加炭黑、膨脹石墨有利于提高電池在HRPSoC下的循環(huán)壽命,最大循環(huán)次數(shù)分別達(dá)到12508次和11434次,是不含碳電池循環(huán)壽命的三倍；而添加鱗片石墨只能小幅度提高電池循環(huán)壽命,相比不含碳電池最多只能提高2000多次；負(fù)極板中添加膠體石墨并不能改善電池在HRPSoC下的循環(huán)性能,膠體石墨含量較少時(shí)反而會降低電池的循環(huán)壽命。
[Abstract]:During the use of hybrid electric vehicles, the surface of the anode is easily salinized with sulphuric acid, which leads to the electrolyte not diffusing into the plate, which makes the battery fail. The sulphation of negative plate can be effectively inhibited by adding carbon additive to the negative electrode. In this paper, the effects of different carbon materials on the charge acceptance of the battery, the discharge performance at different rates at room temperature and low temperature, and the cycle life of the battery under HRPSoC are studied. In this paper, four kinds of carbon materials were selected: carbon black, expanded graphite, flake graphite and colloidal graphite. The effect of different carbon on the conductivity of electrode plate was studied by measuring the conductivity of different carbon-bearing lead powder. The results show that the ability of carbon material to improve the conductivity of polar plate is as follows: carbon black flake graphite expanded graphite colloidal graphite. By adding different kinds of carbon materials to the anode plate and testing the charging performance, the effect of different carbon on the charge acceptance capacity of the battery was studied. The results show that the lower carbon black content of negative plate is the best to improve the charging performance of the battery, while the higher the carbon content of graphite is, the better the charging performance of the battery is. The effects of different carbon additives on the discharge performance of the batteries at room temperature and low temperature were studied by the 2 h rate, 2C discharge test and 1C C 2C discharge test at 25 鈩，

本文編號：2280984