Research Article
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 | ā | 1.12% | 0.46% | 3.38% | 1.22% |
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