Hi, Attached is an LTSpice file and pictures where I'm trying to simulate an A123 LiFePo4 Battery (discharge only for now). On the very left, there is the current controlled current source F1 mirroring the current through E1. By doing this it's charging C1 and therefore showing the discharge status (0V full, 2.3V empty) of the simulated Battery. I1 is a constat current soure supplying 1A and generating the charge dependent volltage of the Battery over R2 with the long equation on the bottom. The voltage controlled voltage source E1 finally generates the output voltage of the battery. R4 is only for simulating the empty battery by making it tristate. I2 simulates the load. The Equation is based on several discharge courves of LiFePo4s between 1C and 20C discharge rate. Not mentioned (for now) is the capacity loss at high discharge rates. (Please tell me if i shall explain it more detailled) My final goal is a chargeable and dischargeable simulation of LiFePo4 Packs for small number of cycles (no cycle aging) and self set capacity differences to engineer a balancer. What do you think about my simulation? Whats improvable or which other way could it be done. King regards --Daniel
Attached files:
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LiFePo4.PNG
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