Battery pack, battery protection processsing apparatus, and control method of the battery protection processing apparatus
First Claim
1. A battery pack composed of a secondary battery integrally with a processing circuit to perform processes including protection against error occurrence in the secondary battery, the battery pack comprising:
- discharge current cutoff means for selectively cutting off a discharge current in the secondary battery;
charge current cutoff means for selectively cutting off a charge current in the secondary battery;
voltage detection means for digitizing and outputting a voltage between a positive electrode and a negative electrode of the secondary battery;
protection process means for, based on at least an output voltage value from the voltage detection means, determining a state of the secondary battery out of overcharge, normal operation, and over-discharge states and, according to a determined state, controlling operations of the discharge current cutoff means and the charge current cutoff means; and
overcurrent detection means for providing control to enable the discharge current cutoff means in preference to the protection process means when the secondary battery is determined to be in an overcurrent state based on a charge and discharge current size of the secondary battery.
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Accused Products
Abstract
It is aimed at stably implementing a protection function of a secondary battery mainly under software control and providing a battery pack characterized by a reduced circuit installation area, parts costs, and power consumption. An AD converter outputs a voltage value between a positive electrode and a negative electrode of a secondary battery. Based on the voltage value, a microcontroller determines a state of the secondary battery out of overcharge, normal operation, and over-discharge states. According to the determined state, the microcontroller controls operations of a discharge current cutoff means and a charge current cutoff means via a FET driver. When it is determined that the secondary battery is placed in an overcurrent state based on the charge and discharge current size of the secondary battery, an overcurrent detection circuit enables the discharge current cutoff means to be a cutoff state in preference to control by the microcontroller.
68 Citations
17 Claims
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1. A battery pack composed of a secondary battery integrally with a processing circuit to perform processes including protection against error occurrence in the secondary battery, the battery pack comprising:
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discharge current cutoff means for selectively cutting off a discharge current in the secondary battery;
charge current cutoff means for selectively cutting off a charge current in the secondary battery;
voltage detection means for digitizing and outputting a voltage between a positive electrode and a negative electrode of the secondary battery;
protection process means for, based on at least an output voltage value from the voltage detection means, determining a state of the secondary battery out of overcharge, normal operation, and over-discharge states and, according to a determined state, controlling operations of the discharge current cutoff means and the charge current cutoff means; and
overcurrent detection means for providing control to enable the discharge current cutoff means in preference to the protection process means when the secondary battery is determined to be in an overcurrent state based on a charge and discharge current size of the secondary battery. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A battery protection processing apparatus to perform processes including protection against error occurrence in the secondary battery, the apparatus comprising:
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discharge current cutoff means for selectively cutting off a discharge current in the secondary battery;
charge current cutoff means for selectively cutting off a charge current in the secondary battery;
voltage detection means for digitizing and outputting a voltage between a positive electrode and a negative electrode of the secondary battery;
protection process means for, based on an output voltage value from the voltage detection means, determining a state of the secondary battery out of overcharge, normal operation, and over-discharge states and, according to a determined state, controlling operations of the discharge current cutoff means and the charge current cutoff means; and
overcurrent detection means for providing control to enable the discharge current cutoff means in preference to the protection process means when the secondary battery is determined to be in an overcurrent state based on a charge and discharge current size of the secondary battery.
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16. A control method of a battery protection processing apparatus to perform processes including protection against error occurrence in the secondary battery comprising the steps of:
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determining a state of the secondary battery out of overcharge, normal operation, and over-discharge states based on an inter-electrode voltage between a positive electrode and a negative electrode of the secondary battery and, according to a determined state, performing a protection process to control operations of a discharge current cutoff circuit to selectively cut off a discharge current of the secondary battery and a charge current cutoff circuit to selectively cut off a charge current of the secondary battery; and
providing control to enable the discharge current cutoff circuit in preference to the protection process when the secondary battery is determined to be in an overcurrent state based on a charge and discharge current size of the secondary battery. - View Dependent Claims (17)
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Specification