Battery charged condition computing device and battery charged condition computing method
First Claim
1. A battery charging state arithmetic operation device, characterized by comprising:
- battery voltage detection means for detecting a voltage of a battery;
battery current detection means for detecting a current of the battery;
first current-voltage characteristic storage means for approximately obtaining a current-voltage characteristic of the battery in a first state as a currently used state by using voltage values and current values detected by the battery voltage detection means and the battery current detection means at plural sampling points and for storing it as a first current-voltage characteristic;
second current-voltage characteristic storage means for previously storing a second current-voltage characteristic in a second state where amount of extractive energy is smaller than that in the first state;
specified current value storage means for storing a specified load current value of the battery;
battery voltage calculation means with specified load for calculating a first battery voltage when the battery current is at the specified load current value by using the first current-voltage characteristic stored in the first current-voltage characteristic storage means and for calculating a second battery voltage when the battery current is at the specified load current value by using the second current-voltage characteristic; and
charging state arithmetic operation means for calculating a charging state of the battery in the first state by using the first and the second battery voltages calculated by the battery voltage calculation means with specified load.
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Abstract
In order to provide a battery charging state arithmetic operation device which can judge a charging state of a battery currently being used easily and in a short time, there are provided battery voltage calculation means 6 with specified load for calculating a first and a second battery voltages when a battery current is at a specified load current value from a first I-V characteristic of the battery which is in a first state as a currently used state and is stored in first I-V characteristic storage means 3 and a second I-V characteristic which is in a second state where the amount of remaining energy is small and is stored in second I-V characteristic storage means 4, and SOC arithmetic operation means 7 for calculating an SOC (charging state) of the battery in the first state by using the first and the second battery voltages calculated.
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Citations
14 Claims
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1. A battery charging state arithmetic operation device, characterized by comprising:
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battery voltage detection means for detecting a voltage of a battery;
battery current detection means for detecting a current of the battery;
first current-voltage characteristic storage means for approximately obtaining a current-voltage characteristic of the battery in a first state as a currently used state by using voltage values and current values detected by the battery voltage detection means and the battery current detection means at plural sampling points and for storing it as a first current-voltage characteristic;
second current-voltage characteristic storage means for previously storing a second current-voltage characteristic in a second state where amount of extractive energy is smaller than that in the first state;
specified current value storage means for storing a specified load current value of the battery;
battery voltage calculation means with specified load for calculating a first battery voltage when the battery current is at the specified load current value by using the first current-voltage characteristic stored in the first current-voltage characteristic storage means and for calculating a second battery voltage when the battery current is at the specified load current value by using the second current-voltage characteristic; and
charging state arithmetic operation means for calculating a charging state of the battery in the first state by using the first and the second battery voltages calculated by the battery voltage calculation means with specified load. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A battery charging state arithmetic operation device comprising:
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battery voltage detection means for detecting a voltage of a battery;
battery current detection means for detecting a current of the battery;
first current-voltage characteristic storage means for approximately obtaining a current-voltage characteristic of the battery in a first state as a currently used state by using voltage values and current values detected by the battery voltage detection means and the battery current detection means at plural sampling points and for storing it as a first current-voltage characteristic;
second current-voltage characteristic storage means for previously storing a third current-voltage characteristic in a third state where the amount of extractive energy is larger than that in the first state and a second current-voltage characteristic in a second state where the amount of extractive energy is smaller than that in the first state;
specified current value storage means for storing a specified load current value of the battery;
battery voltage calculation means with specified load for calculating a first battery voltage when the battery current is at the specified load current value by using the first current-voltage characteristic stored in the first current-voltage characteristic storage means, for calculating a second battery voltage when the battery current is at the specified load current value by using the second current-voltage characteristic, and for calculating a third battery voltage when the battery current is at the specified load current value by using the third current-voltage characteristic; and
charging state arithmetic operation means for calculating a charging state of the battery in the first state by using the first, the second and the third battery voltages calculated by the battery voltage calculation means with specified load. - View Dependent Claims (8, 9, 10, 11)
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12. A battery charging state arithmetic operation method, characterized by comprising:
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a step of detecting voltage values and current values of a battery in a first state as a currently used state at plural sampling points;
a step of approximately obtaining a current-voltage characteristic of the battery in the first state by using the voltage values and the current values of the battery detected at the plural sampling points and storing it as a first current-voltage characteristic;
a step of previously storing the third current-voltage characteristic in a third state where the amount of extractive energy is larger than that in the first state and the second current-voltage characteristic in a second state where the amount of extractive energy is smaller than that in the first state;
a step of storing a specified load current value of the battery;
a step of calculating a first battery voltage when the battery current is at the specified load current value by using the first current-voltage characteristic, calculating a second battery voltage when the battery current is at the specified load current value by using the second current-voltage characteristic, and calculating a third battery voltage when the battery current is at the specified load current value by using the third current-voltage characteristic; and
a step of calculating a charging state of the battery in the first state by using the first, the second and the third battery voltages calculated. - View Dependent Claims (13, 14)
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Specification