Internal resistance calculating device
First Claim
1. An internal resistance calculating device for calculating an internal resistance value of a secondary battery, the device comprising:
- a charging/discharging unit configured to charge or discharge the secondary battery;
a voltage measuring unit configured to measure a both-end voltage value of the secondary battery;
a first voltage holding unit configured to hold a first voltage value, the first voltage value corresponding to the both-end voltage value obtained when the both-end voltage value, which is measured by the voltage measuring unit after the charging or the discharging carried out by the charging/discharging unit is started, has become a predetermined threshold voltage value;
a second voltage holding unit configured to hold, as a second voltage value, the both-end voltage value of the secondary battery when charge current or discharge current is changed for a predetermined value or more within a predetermined time after the both-end voltage value has become the first voltage value;
a current measuring unit configured to measurea first current value which is a charge current value or a discharge current value when the both-end voltage value has become the first voltage value, anda second current value which is a charge current value or a discharge current value when the both-end voltage value has become the second voltage value; and
an internal resistance calculating unit configured to calculate an internal resistance value of the secondary battery based on the first voltage value, the second voltage value, the first current value and the second current value.
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Accused Products
Abstract
An internal resistance calculating device includes a charging unit charging a secondary battery, a voltage measuring unit measuring a both-end voltage value of the secondary battery, a capacitor holding a first voltage value predetermined by the both-end voltage value measured by the voltage measuring unit after charging is started, a capacitor holding, as a second voltage value, the both-end voltage value when charge current is changed for a predetermined current value or more within predetermined time after the both-end voltage value become the first voltage value, a current measuring unit measuring a first charge current value when the both-end voltage value become a threshold-value voltage and a second charge current value when the both-end voltage value become the second voltage value, and a μCOM calculating an internal resistance value of the secondary battery based on the first and second voltage values and the first and second charge current values.
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Citations
4 Claims
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1. An internal resistance calculating device for calculating an internal resistance value of a secondary battery, the device comprising:
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a charging/discharging unit configured to charge or discharge the secondary battery; a voltage measuring unit configured to measure a both-end voltage value of the secondary battery; a first voltage holding unit configured to hold a first voltage value, the first voltage value corresponding to the both-end voltage value obtained when the both-end voltage value, which is measured by the voltage measuring unit after the charging or the discharging carried out by the charging/discharging unit is started, has become a predetermined threshold voltage value; a second voltage holding unit configured to hold, as a second voltage value, the both-end voltage value of the secondary battery when charge current or discharge current is changed for a predetermined value or more within a predetermined time after the both-end voltage value has become the first voltage value; a current measuring unit configured to measure a first current value which is a charge current value or a discharge current value when the both-end voltage value has become the first voltage value, and a second current value which is a charge current value or a discharge current value when the both-end voltage value has become the second voltage value; and an internal resistance calculating unit configured to calculate an internal resistance value of the secondary battery based on the first voltage value, the second voltage value, the first current value and the second current value. - View Dependent Claims (2, 3, 4)
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Specification