SECONDARY BATTERY TESTER

摘要

Provided is a simple secondary battery tester that obtains, without applying an AC signal for determination based on capacitance, the capacitance of a secondary battery from time characteristics of a current flowing to the secondary battery and a terminal voltage and determines whether the secondary battery is degraded based on the capacitance thus obtained.;The secondary battery tester includes a voltage sensor 32 for measuring a terminal voltage of a secondary battery 10 and a current sensor 34 for measuring the current. The secondary battery tester, without applying the AC signal, obtains capacitance C from measured values of time characteristics of the voltage and the current those being measured and compares the preliminarily stored reference capacitance with the capacitance C derived from the measured values, thereby determining whether the secondary battery is degraded.

主权项

1. A secondary battery tester comprising:
a voltage measuring unit for measuring a terminal voltage between a positive electrode and a negative electrode of a secondary battery without applying an AC voltage; a current measuring unit for measuring a current flowing between the positive electrode and the negative electrode of the secondary battery without applying an alternating current; a capacitance deriving means for deriving, from the voltage measured by the voltage measuring unit and the current measured by the current measuring unit, capacitance of the secondary battery at a predetermined time from the start of measurement; a storage unit for preliminarily storing temporal variation of capacitance of a normal secondary battery; and a determination means for comparing the capacitance at the predetermined time derived by the capacitance deriving means and the capacitance at the predetermined time obtained from the temporal variation of the capacitance stored in the storage unit, and determining whether the secondary battery being measured is degraded.