how to build the circuit model for Li battery

[huashizng]

Hi, now i am designing a charger for Li-battery using buck structure. i need to simulate the chip loop ac stability. so i want to model the Li-battery. my ideal is use a large capacitor(50F) and a small resistor to stead the battery. but such large capacitor will lead to unstability obviously. somebody told me i should use small capacitor(20uF). i don't know why i should do so? according i know,the equivalent capacitor of the battery is very very large, for example,1KF. who can tell me how should i model the Li-battery in the ac simulation?[/list]

 

[jutek]

hi

maybe these will be helpful

**broken link removed**
https://users.ece.gatech.edu/rincon-mora/research/gtac/gtac_s05_bat_mod.pdf

regards

 

[patchiemocorro]

hi

maybe these will be helpful

**broken link removed**
https://users.ece.gatech.edu/rincon-mora/research/gtac/gtac_s05_bat_mod.pdf

regards

Hello Jutek,

I saw the graphs of the ppt you shared,but I saw the parameters extracted was from Lithium-Ion.I just would like to ask if this method can be applied for extracting parameters for NiMH since these two batteries have different charging and discharging behavior.Thanks again for sharing.