Full
Outline
The precise identification of model parameters for lithium-ion batteries is crucial for the observing of remaining battery capacity and extending the service life. However, traditional parameter identification methods are often affected by parameter coupling, getting trapped in a local optimum, and other factors, which reduce the estimation accuracy and subsequently lower the accuracy of the subsequent joint estimation. Therefore, an SOC-SOH joint estimation based on a three-stage parameter identification method is proposed. In the first stage, an RC model with fast and slow dynamic modules is constructed based on the internal dynamic characteristics of the battery. In the second stage, the fast dynamic (FD) module uses the forgetting factor recursiveleast squares (FFRLS) adaptive parameter identification method to identify the parameters R0, R1, and C1 with a forgetting factor. In the third stage, the slow dynamic (SD) module uses the adaptive extended Kalman filter algorithm (AEKF) for online parameter identification, and combines the zebra optimization algorithm (ZOA) to solve the local optimum problem and further improve the accuracy of the parameter identification of UOC, R2, and C2. Considering that battery capacity and battery state have different time-varying characteristics, a multi-time scale method is used for the SOC-SOH joint estimation to improve the estimation accuracy. The simulation results show that the improved joint estimation method has better estimation characteristics than traditional methods in terms of average error and maximum error of SOC estimation under different temperatures and operating conditions.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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