ELECTRIC STORAGE SYSTEM
First Claim
1. An electric storage system comprising:
- a voltage sensor detecting a voltage value of an electric storage apparatus;
a current sensor detecting a current value of the electric storage apparatus; and
a controller setting an allowable discharge electric power serving as an upper limit electric power to which discharge of the electric storage apparatus is allowed,wherein the controller uses the voltage value at present, the current value at present, and an internal resistance value at present of the electric storage apparatus to calculate a reference voltage value, the reference voltage value being the voltage value when no current flows,the controller uses the reference voltage value and a predetermined internal resistance value to calculate a dischargeable electric power, the predetermined internal resistance value being previously set to be higher than the internal resistance value at present, the dischargeable electric power being an electric power when a discharge electric power of the electric storage apparatus is increased to cause the voltage value to reach a lower limit voltage value, andthe controller sets the dischargeable electric power as the allowable discharge electric power when temporarily increasing the discharge electric power required of the electric storage apparatus.
1 Assignment
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Accused Products
Abstract
A reference voltage value is calculated by using a current value, a voltage value, and an internal resistance value of an electric storage apparatus. A dischargeable electric power is calculated by using the reference voltage value and a predetermined internal resistance value previously set to be higher than the internal resistance value. The dischargeable electric power is set as an allowable discharge electric power when temporarily increasing the discharge electric power required of the electric storage apparatus. The reference voltage value is calculated from the internal resistance value and is a fixed value regardless of the relationship between the current value and the voltage value. The dischargeable electric power is also constant. Since the predetermined internal resistance value is higher than the internal resistance value, the dischargeable electric power can be set while the deterioration of the electric storage apparatus is taken into account.
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Citations
10 Claims
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1. An electric storage system comprising:
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a voltage sensor detecting a voltage value of an electric storage apparatus; a current sensor detecting a current value of the electric storage apparatus; and a controller setting an allowable discharge electric power serving as an upper limit electric power to which discharge of the electric storage apparatus is allowed, wherein the controller uses the voltage value at present, the current value at present, and an internal resistance value at present of the electric storage apparatus to calculate a reference voltage value, the reference voltage value being the voltage value when no current flows, the controller uses the reference voltage value and a predetermined internal resistance value to calculate a dischargeable electric power, the predetermined internal resistance value being previously set to be higher than the internal resistance value at present, the dischargeable electric power being an electric power when a discharge electric power of the electric storage apparatus is increased to cause the voltage value to reach a lower limit voltage value, and the controller sets the dischargeable electric power as the allowable discharge electric power when temporarily increasing the discharge electric power required of the electric storage apparatus. - View Dependent Claims (2, 3, 4, 5)
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6. An electric storage system comprising:
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a voltage sensor detecting a voltage value of an electric storage apparatus; a current sensor detecting a current value of the electric storage apparatus; and a controller setting an allowable charge electric power serving as an upper limit electric power to which charge of the electric storage apparatus is allowed, wherein the controller uses the voltage value at present, the current value at present, and an internal resistance value at present of the electric storage apparatus to calculate a reference voltage value, the reference voltage value being the voltage value when no current flows, the controller uses the reference voltage value and a predetermined internal resistance value to calculate a chargeable electric power, the predetermined internal resistance value being previously set to be higher than the internal resistance value at present, the chargeable electric power being an electric power when a charge electric power of the electric storage apparatus is increased to cause the voltage value to reach an upper limit voltage value, and the controller sets the chargeable electric power as the allowable charge electric power when temporarily increasing the charge electric power required of the electric storage apparatus. - View Dependent Claims (7, 8, 9, 10)
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Specification