ACCUMULATOR BATTERY SYSTEM AND A METHOD FOR EVALUATING THE INTERNAL STATE OF AN ACCUMULATOR BATTERY Russian patent published in 2020 - IPC H01M10/42 G01R31/36 H02J7/00 

FIELD: electrical engineering.

SUBSTANCE: invention relates to electrical engineering, namely to a storage battery system and a method for evaluating the internal state of an accumulator battery, and can be used, for example, in an electrified vehicle with an accumulator battery. System includes a storage battery having a positive electrode, which includes an active substance of a positive electrode, and a negative electrode, which includes first and second active substances of the negative electrode, and a control device which evaluates the internal state of the battery based on the battery active material model. Control device calculates the number of charge carriers in the first active substance of the negative electrode based on the model of the first active substance, under such condition that the first and second active substances of the negative electrode have identical potential, calculates a value of variation of potential of the open circuit of the first active substance of the negative electrode on the basis of surface mechanical stress of the first active substance of the negative electrode and calculates open circuit potential of negative electrode from potential of open circuit and value of open active circuit potential of first active substance of negative electrode.

EFFECT: high accuracy of estimating the internal state of a storage battery is the technical result of the invention.

9 cl, 25 dwg