Estimation of State of Charge for Lithium-Ion Battery Based on Finite Difference Extended Kalman Filter

Table 3

Comparison of the simulated and experimental SOC results.

Comparison point	True SOC	Simulation error of SOC		Experimental error of SOC
		EKF	FDEKF	EKF	FDEKF
First Loop end point	0.172	0.8%	0.4%	1.7%	0.9%
Second Loop end point	0.352	0.9%	0.3%	2.6%	1.1%
Third Loop end point	0.532	1.0%	0.4%	4.0%	1.3%
Forth Loop end point	0.712	1.4%	0.5%	3.7%	1.3%
Fifth Loop end point	0.893	1.5%	0.7%	4.9%	1.5%
Average error	—	1.12%	0.46%	3.38%	1.22%