Full
Outline
The inconsistency problem of lithium-ion batteries is one of the key factors affecting the overall performance output of battery packs, and accurate estimation of inconsistency parameters is crucial for the health management and optimization control of battery packs. The traditional complex single battery cell parameter estimation algorithm faces the problem of huge computational complexity when extended to all cells within the battery pack. A method for estimating inconsistent parameters based on an offline single battery cell simulation database is proposed. First, by building an equivalent circuit model to simulate and generate a comprehensive battery sample database. Then, segment voltage characteristic curves are extracted from the target battery charging data and compared with the sample library. Based on similarity measurement, the best matching sample is locked, thereby achieving rapid estimation of the capacity and internal resistance of all battery cells in the group. Subsequently, considering the interference of interpolation errors in the method and voltage sampling errors in practical applications, a correction mechanism based on sliding window search is proposed to improve estimation accuracy. Finally, method validation was conducted on 60 single battery-cell series connected battery packs set up in a laboratory environment. The results showed that the mean absolute percentage error (MAPE) of the capacity did not exceed 0.40%, and MAPE of the internal resistance did not exceed 2.60%, and maintained good stability on simulated sampling error noise data.
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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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