Secondary Battery System
First Claim
1. A secondary battery system comprising:
- a battery module having at least one lithium ion battery;
a measuring device for measuring a voltage and a temperature of the battery module;
a state of charge detection device for detecting a state of charge based on the voltage; and
a charge-discharge control device;
wherein an estimated battery resistance of the battery module is calculated based on a standard battery resistance, a standard initial battery resistance, and a measured initial battery resistance.
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Abstract
Since in existent charge-discharge control the battery direct current resistance of a lithium ion battery increases at a low temperature or in a low SOC, the battery voltage may possibly exceed greatly the maximum allowable voltage instantaneously due to over-voltage during charging or may possibly decrease greatly to less than the minimum allowable voltage during discharging. If the lithium ion battery continuously lies in such a state the battery performance is degraded abruptly.
The battery resistance of a lithium ion battery module is estimated in accordance with SOC and temperature of the lithium ion battery module, and current to charge is set properly based on the estimated battery resistance.
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Citations
13 Claims
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1. A secondary battery system comprising:
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a battery module having at least one lithium ion battery; a measuring device for measuring a voltage and a temperature of the battery module; a state of charge detection device for detecting a state of charge based on the voltage; and a charge-discharge control device; wherein an estimated battery resistance of the battery module is calculated based on a standard battery resistance, a standard initial battery resistance, and a measured initial battery resistance. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. An control method for a secondary battery system with a battery module having at least one lithium ion battery, comprising;
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measuring a voltage and a temperature of the battery module; detecting a state of charge based on the voltage; and calculating an estimated battery resistance of the battery module based on a standard battery resistance, a standard initial battery resistance, and a measured initial battery resistance.
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Specification