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 field effect transistor (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 battery voltage of the battery;
a comparator to determine whether the battery management system is shut down, and in response to determining that the battery management system is shut down, 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, a charge field effect transistor (FET) and a discharge FET connected between the external terminal and the cell terminal, a voltage sensor to measure a battery 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.
8 Citations
12 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 field effect transistor (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 battery voltage of the battery; a comparator to determine whether the battery management system is shut down, and in response to determining that the battery management system is shut down, 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)
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3. 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 field effect transistor (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 battery 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, wherein the voltage sensor is configured to measure the battery voltage at a set time interval and to transmit the measured battery voltage to the comparator in real time. - View Dependent Claims (4, 5, 6, 7)
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8. 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 field effect transistor (FET) provided between the cell terminal and the external terminal to prevent charging of the battery. - View Dependent Claims (9, 10, 11, 12)
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Specification