BATTERY PACK AND OVERDISCHARGE CONTROL METHOD THEREOF
First Claim
1. A battery pack comprising a battery and a battery management system electrically connected to the battery to control and manage charging and discharging of the battery, the battery management system comprising:
- an external terminal configured to connect to a charger or an external electronic device;
a cell terminal connected to the battery;
a charge FET and a discharge FET connected in series between the external terminal and the cell terminal;
a voltage sensor connected to the cell terminal to measure a voltage of the battery;
a comparator to compare the battery voltage with a reference voltage to determine whether the battery pack is in an overdischarged state; and
a controller to control the charge FET to prevent charging of the battery if the comparator determines that the battery pack is in the overdischarged state.
1 Assignment
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Accused Products
Abstract
A battery pack includes a battery and a battery management system to control and manage charging and discharging of the battery. The battery management system includes an external terminal connected to a charger or an external electronic device, a cell terminal connected to the battery, charge and discharge FETs connected between the external terminal and the cell terminal, a voltage sensor a voltage of the battery, a comparator comparing the battery voltage with a reference voltage to determine whether the battery pack is in an overdischarged state, and a controller controlling the charge FET to be cut off to prevent a charge operation of the battery, if the comparator determines that the battery pack is in an overdischarged state.
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11 Claims
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1. A battery pack comprising a battery and a battery management system electrically connected to the battery to control and manage charging and discharging of the battery, the battery management system comprising:
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an external terminal configured to connect to a charger or an external electronic device; a cell terminal connected to the battery; a charge FET and a discharge FET connected in series between the external terminal and the cell terminal; a voltage sensor connected to the cell terminal to measure a voltage of the battery; a comparator to compare the battery voltage with a reference voltage to determine whether the battery pack is in an overdischarged state; and a controller to control the charge FET to prevent charging of the battery if the comparator determines that the battery pack is in the overdischarged state. - View Dependent Claims (2, 3, 4, 5, 6)
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7. An overdischarge control method of a battery pack comprising:
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when a charger is electrically connected to an external terminal of the battery pack, measuring a battery voltage at a time interval, the battery voltage being a voltage of a battery electrically connected to a cell terminal of the battery pack; comparing the battery voltage with a first reference voltage to determine whether a battery management system of the battery pack is shut down; if the battery voltage is less than or equal to the first reference voltage, comparing the battery voltage with a second reference voltage to determine whether the battery pack is in an overdischarged state; and if the battery voltage is less than or equal to the second reference voltage, controlling a charge FET provided between the cell terminal and the external terminal to prevent charging of the battery. - View Dependent Claims (8, 9, 10, 11)
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Specification