Journal
BATTERIES-BASEL
Volume 8, Issue 10, Pages -Publisher
MDPI
DOI: 10.3390/batteries8100140
Keywords
LFP battery; SOC; RAE; electrical-thermal coupling; low temperature
Funding
- National Key R&D Program of China [2021YFB2401901]
- China Postdoctoral Science Foundation [2021M691729]
- Beijing Science and Technology Planning Project [Z211100004221011]
- National Natural Science Foundation of China [52177217, 52037006]
- Beijing Natural Science Foundation [3212031]
- Tsinghua-Toyota Joint Research Fund [20213930025]
Ask authors/readers for more resources
This paper introduces an artificial intelligence-based electrical-thermal coupling battery model and an application-oriented procedure for estimating SOC and RAE in a reliable and effective battery management system. The paper also proposes a model-based strategy for controlling the battery's thermal state in low temperature. Simulation results show that the proposed method can accurately estimate SOC and RAE, and the preheating strategy significantly improves energy output.
The LiFePO4 (LFP) battery tends to underperform in low temperature: the available energy drops, while the state of charge (SOC) and residual available energy (RAE) estimation error increase dramatically compared to the result under room temperature, which causes mileage anxiety for drivers. This paper introduces an artificial intelligence-based electrical-thermal coupling battery model, presents an application-oriented procedure to estimate SOC and RAE for a reliable and effective battery management system, and puts forward a model-based strategy to control the battery thermal state in low temperature. Firstly, an LFP battery electrical model based on artificial intelligence is proposed to estimate the terminal voltage, and a thermal resistance model with an EKF estimation algorithm is established to assess the temperature distribution in the battery pack. Then, the electrical and thermal models are coupled, a closed-loop EKF algorithm is employed to estimate the battery SOC, and a fusion method is discussed. The coupled model is simulated under a given protocol and RAE can be obtained. Finally, based on the electrical-thermal coupling model and RAE calculation algorithm, a preheating method and constant power condition-based RAE estimation are discussed, and the thermal management strategy of the battery system under low temperature is formed. Results show that the estimation error of SOC can be controlled within 2% and RAE can be controlled within 4%, respectively. The preheating strategy at low temperature and low SOC can significantly improve the energy output of the battery pack system.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available