The present disclosure provides a method and system for estimating a state of charge of a lithium battery of a vehicle. The method includes providing a non-linear function of the lithium battery, normalizing the lithium surface density and the actual voltage at the current of the lithium battery having an internal resistance. The method further includes determining an actual lithium surface density based on an actual voltage related to an inverse function of the non-linear function. The method further includes determining a variation parameter based on the actual lithium surface density relative to the first diffusion model. The method further includes determining a predicted lithium surface density based on the variation parameter relative to the second diffusion model. The method further includes determining an estimated state of charge of the lithium battery when a difference between the predicted lithium surface density and the actual lithium surface density is less than a first threshold.
本公开提供了一种用于估计车辆锂电池的充电状态的方法和系统。该方法包括提供锂电池的非线性函数、归一化锂表面密度和具有内阻的锂电池的电流下的实际电压。该方法进一步包括基于与非线性函数的反函数相关的实际电压确定实际的锂表面密度。该方法进一步包括基于相对于第一扩散模型的实际的锂表面密度确定变化参数。该方法进一步包括基于相对于第二扩散模型的变化参数确定预测的锂表面密度。该方法进一步包括当预测的锂表面密度和实际的锂表面密度之间的差值小于第一阈值时,确定锂电池的估计充电状态。
System and method for estimating state of charge of lithium battery of vehicle
用于估计车辆锂电池的充电状态的系统和方法
08.07.2022
Patent
Elektronische Ressource
Chinesisch
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