INTERNAL RESISTANCE CALCULATION DEVICE AND INTERNAL RESISTANCE CALCULATION METHOD

摘要

PROBLEM TO BE SOLVED: To provide an internal resistance calculation device which is operable during discharging and in which the internal resistance is properly calculated.

SOLUTION: An internal resistance calculation device includes: a memory 14 which stores a plurality of tables indicating a correlation between a voltage and a charge rate obtained in advance of a lithium ion secondary battery 2; and a CPU 13 which calculates the internal resistance for every time when referring to every table stored in the memory 14. Each table includes: a first table indicating the correlation between an open voltage and the charge rate of the lithium ion secondary battery 2; and a second table indicating the correlation between the voltage and the charge rate in a state of passing a current of 0.2 C through the lithium ion secondary battery 2. The CPU 13 performs calculation by referring to one of the tables.

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