The invention discloses an SOC estimation method and system and an SOH estimation method of a lithium iron phosphate battery. The SOC estimation method comprises the steps of obtaining an SOH value of a current battery; in the slow charging process of the lithium iron phosphate battery, the voltage of the current battery is collected, and the SOC value of the current battery is estimated by using an ampere-hour integral method and stored; carrying out characteristic value identification condition judgment, if the characteristic value identification condition is met, determining a first SOC correction value SOCcav1 and a second SOC correction value SOCcav2 according to the SOH value, and then carrying out SOC correction condition judgment; if the SOC correction condition I is met, the SOC value of the current battery is made to be a first SOC correction value SOCcav1, and if the SOC correction condition II is met, the SOC value of the current battery is made to be a second SOC correction value SOCcav2. According to the invention, the SOC and SOH estimation precision can be improved.
本发明公开了一种磷酸铁锂电池的SOC估算方法、系统及SOH估算方法,所述SOC估算方法包括:获取当前电池的SOH值;在磷酸铁锂电池慢充充电过程中,采集当前电池的电压,利用安时积分法估算当前电池的SOC值,并存储;进行特征值识别条件判断,若满足特征值识别条件,则根据所述SOH值确定第一SOC修正值SOCcav1和第二SOC修正值SOCcav2,再进行SOC修正条件判断;若满足SOC修正条件Ⅰ,则使当前电池的SOC值为第一SOC修正值SOCcav1,若满足SOC修正条件Ⅱ,则使当前电池的SOC值为第二SOC修正值SOCcav2。本发明能提高SOC和SOH估算精度。
SOC (State of Charge) estimation method and system of lithium iron phosphate battery and SOH (State of Health) estimation method
磷酸铁锂电池的SOC估算方法、系统及SOH估算方法
2022-12-27
Patent
Elektronische Ressource
Chinesisch
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