METHOD OF LITHIUM-ION BATTERY RESIDUAL CAPACITY ESTIMATION Russian patent published in 2017 - IPC G01R31/36 

FIELD: electricity.

SUBSTANCE: method involves the battery voltage measuring and the determination of its residual capacity according to the voltage value dependence. At that in operating mode of the battery, based on its mathematical model with experimentaly determined parameters, depending on the level of charge and measured values of discharge/charge current, estimate the present value of battery voltage which is compared with the measured present value U_j(t) of the battery voltage. Calculate the charge level where j is the calculations present iteration number; k-coefficient, characterizing the convergence of the calculation process to the steady state value, E_0max, E_0min - respectively, the maximum and the minimum values of the battery EMF, as defined by the passport data; ε_j(t)-calculation error the battery voltage, . When the condition ε_j(t)≈0 is fullfilled, evaluate the residual capacity of the , where C_full. - the known full battery power, determined by experimental way, depending on the number of cycles of its discharge/charge.

EFFECT: provision of the estimation accuracy of the lithium-ion battery residual capacity without interruption of the operation mode and with restrictions to its computational resources of the microprocessor measuring system.

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