Method and device for estimating discharge depth of lithium primary battery

摘要

Problem to be solved: to suppress the occurrence of calculation error in the discharge depth estimation of the lithium primary battery.The discharge current I and the terminal voltage VL of the lithium primary battery 1 are input parameters.The open voltage OCV is estimated by the parameter estimation method using the open voltage OCV and the internal resistance R of the lithium primary batteryThe discharge depth estimation method of the lithium primary battery 1 for estimating the discharge depth DOD from a predetermined open voltage characteristic isThe initial value r of the internal resistance R in the parameter estimation method isIt is set based on the advance data of the internal resistance R acquired for each discharge depth DOD and discharge current I at the beginning of discharge.If the discharge current I is less than a predetermined first threshold Th1The estimation of the discharge depth DOD is suspended over a predetermined standby time.Diagram