A method for estimating the initial value of battery state of charge

Abstract

The invention discloses a battery state-of-charge initial value estimation method, and solves the problems of high estimation error and low accuracy in the prior art. The battery state-of-charge initial value estimation method comprises six dimensions of processing: input data processing, initial moment data processing, battery state-of-charge initial value estimation, battery state-of-charge initial value failure judgment, battery state-of-charge time efficiency estimation and battery state-of-charge correction. The characteristics of power battery static chemical reaction and vehicle stationary time are fully considered on the basis of the existing battery management system so that the battery state-of-charge estimation precision can be enhanced, and the battery service life and vehicle driving mileage can be enhanced.

Description

technical field [0001] The invention relates to the technical field of battery management, in particular to a method for estimating the initial value of the state of charge of a battery. Background technique [0002] With the development of the new energy industry, more and more new energy electric vehicles are used in various industries. Pure electric vehicles use power batteries as energy sources, and the estimation of battery state of charge is the most important parameter to measure the mileage of vehicles. [0003] In the prior art, the method for estimating the battery state of charge of the vehicle power battery usually adopts the current ampere-hour integration algorithm, and certain corrections are made at both ends of the battery when the battery is too low or too high. The correction method basically uses the current total voltage and temperature of the battery to look up the table to obtain a fixed battery state of charge. The main defects of the existing techn...

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