资源描述
单击此处编辑母版标题样式,单击此处编辑母版文本样式,第二级,第三级,第四级,第五级,BYD COMPANY LIMITED,*,1,LiFePO,4,performance,2006-06-21,2,Outline,What is LiFePO,4,?,Discharge curve,GSM discharge,High temperature Storage,Low temperature discharge,Cycle life,Overcharge,Fire exposure,3,What is LiFePO4?,LiFePO,4,is a new kind of positive material.,LiFePO,4,also has the function that release or receive Li-ion like LiCoO,2,.,LiFePO,4,Olivine structure,FePO,4,Olivine structure,LiFePO,4,Charge,Discharge,4,Discharge curve,LiFePO,4,has the same discharge curve as LiCoO,2,.,LiFePO,4,has the lower MPV(Mid-point voltage)than LiCoO,2,.MPV of LiFePO,4,is 3.13.2V,MPV of LiCoO,2,is 3.63.7V.,5,GSM discharge,Following shows GSM discharge curve(cut off voltage is 2.8V).,GSM1/0.2C,GSM2/0.2C,1#,90.3%,86.0%,2#,88.9%,84.7%,6,High temperature,Storage,Following show storage results of LiFePO4 and LiCoO2 system.,Storage condition,Capacity keeping ratio,(capacity after storage/capacity before storage),Capacity recovering ratio,(capacity after recharge/capacity before storage),60,7days,85.2%,92.8%,85,48hours,75.1%,80.2%,Storage condition,Capacity keeping ratio,(capacity after storage/capacity before storage),Capacity recovering ratio,(capacity after recharge/capacity before storage),60,7days,83.1%,89.2%,85,48hours,72.5%,79.3%,LiCoO2,LiFePO4,7,Low temperature discharge,Following shows discharge of different temperature.,Temp.,60/25,45/25,0/25,-10/25,-20/25,ratio(%),93.4,98.2,72.6,64.2,45.4,8,Cycle life,LiFePO,4,structure keeps stable before and after discharge,so it has good cycle life.,Basing on experience of other projects,LiFePO,4,cycle life can be more than 1000.,Olivine structure,FePO,4,Olivine structure,LiFePO,4,Charge,Discharge,9,Overcharge,LiFePO,4,has good safety performance.,Following show,1C/12V,overcharge result.,Condition,Cell No.,Max temp.,Phenomena,Result,1C/12V,260#,117.10,Swelling,vent open lightly,no fire,no explosion.,Pass,253#,120.05,Pass,271#,120.64,Pass,10,Overcharge,Following show,1C/12V,overcharge curve and cell photos.,Before test,After test,11,Overcharge,LiFePO,4,has good safety performance.,Following show,3C/32V,overcharge result.,Condition,Cell No.,Max temp.,Phenomena,Result,3C/12V,273#,145.44,Swelling,vent open lightly,no fire,no explosion.,Pass,12,Overcharge,Following show,3C/32V,overcharge curve and cell photos.,After test,13,Fire exposure,LiFePO,4,has good safety performance.,Following show the fire exposure result.,Cell No.,Voltage before test(V),Impedance before test(m,),Phenomena,Result,258#,3.47,58.7,Swelling,vent open,no fire,no explosion.,Pass,268#,3.43,52.8,Swelling,vent open,fire,no explosion.,Pass,251#,3.58,56.0,Pass,Before test,After test,14,Thanks,
展开阅读全文