Battery management system and method
First Claim
1. A system for managing a battery having a plurality of battery cells coupled in series, the plurality of battery cells including at least a first battery cell and a second battery cell, the system comprising:
- a first relay having first relay input terminals and first relay output terminals, the first relay input terminals being respectively coupled to a first battery cell anode and to a first battery cell cathode, the first relay being configured to operate in response to a first control signal;
a second relay having second relay input terminals and second relay output terminals, the second relay input terminals being respectively coupled to a second battery cell anode and to a second battery cell cathode, the second relay being configured to operate in response to a second control signal;
a first voltage transmitting unit having first voltage transmitting unit input terminals and a first voltage transmitting unit output terminal, the first voltage transmitting unit input terminals being respectively coupled to the first relay output terminals and to the second relay output terminals, the first voltage transmitting unit being configured to output a voltage from the first voltage transmitting unit input terminals in response to an on-voltage of a third control signal;
a charging unit having a charging unit input terminal and a charging unit output terminal, the charging unit input terminal being coupled to the first voltage transmitting unit output terminal, the charging unit being configured to be charged to a voltage from the first voltage transmitting unit output terminal;
a second voltage transmitting unit having a second voltage transmitting unit input terminal and a second voltage transmitting unit output terminal, the second voltage transmitting unit input terminal being coupled to the charging unit output terminal, the second voltage transmitting unit being configured to output a voltage of the charging unit in response to an on-voltage of a fourth control signal; and
a control signal generator configured to set the voltage of the charging unit as a voltage of the second battery cell by setting the second control signal as an on-voltage while the voltage of the charging unit corresponds to a voltage of the first battery cell.
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Accused Products
Abstract
A battery management system is provided. A voltage of a first battery cell is charged to a capacitor. Then, the voltage of the capacitor is measured, the measured voltage being the voltage of the first battery cell. Subsequently, a voltage of a second battery cell is again charged to the capacitor while the capacitor holds the voltage of the first battery cell. The voltage of the capacitor is then measured, the measured voltage being the voltage of the second battery cell. With such a scheme, the time for discharging the capacitor may be removed, and accordingly, a period for measuring a voltage of the battery cell may become shorter.
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Citations
27 Claims
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1. A system for managing a battery having a plurality of battery cells coupled in series, the plurality of battery cells including at least a first battery cell and a second battery cell, the system comprising:
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a first relay having first relay input terminals and first relay output terminals, the first relay input terminals being respectively coupled to a first battery cell anode and to a first battery cell cathode, the first relay being configured to operate in response to a first control signal;
a second relay having second relay input terminals and second relay output terminals, the second relay input terminals being respectively coupled to a second battery cell anode and to a second battery cell cathode, the second relay being configured to operate in response to a second control signal;
a first voltage transmitting unit having first voltage transmitting unit input terminals and a first voltage transmitting unit output terminal, the first voltage transmitting unit input terminals being respectively coupled to the first relay output terminals and to the second relay output terminals, the first voltage transmitting unit being configured to output a voltage from the first voltage transmitting unit input terminals in response to an on-voltage of a third control signal;
a charging unit having a charging unit input terminal and a charging unit output terminal, the charging unit input terminal being coupled to the first voltage transmitting unit output terminal, the charging unit being configured to be charged to a voltage from the first voltage transmitting unit output terminal;
a second voltage transmitting unit having a second voltage transmitting unit input terminal and a second voltage transmitting unit output terminal, the second voltage transmitting unit input terminal being coupled to the charging unit output terminal, the second voltage transmitting unit being configured to output a voltage of the charging unit in response to an on-voltage of a fourth control signal; and
a control signal generator configured to set the voltage of the charging unit as a voltage of the second battery cell by setting the second control signal as an on-voltage while the voltage of the charging unit corresponds to a voltage of the first battery cell. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method of managing a battery having a plurality of battery cells coupled in series, the plurality of battery cells including a first battery cell and a second battery cell, the method comprising:
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charging a capacitor with a first battery cell voltage;
measuring the first battery cell voltage using the voltage charged to the capacitor corresponding to the first battery cell voltage;
charging the capacitor with a second battery cell voltage under a condition that the capacitor is charged with the first battery cell voltage; and
measuring the second battery cell voltage using the voltage charged to the capacitor corresponding to the second battery cell voltage. - View Dependent Claims (12, 13, 14, 15)
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16. A system for managing a battery having a plurality of battery cells, the plurality of battery cells being divided into a plurality of cell groups, the system comprising:
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a plurality of cell voltage measurers respectively coupled to the plurality of cell groups;
an analog/digital converter configured to convert voltages measured by the plurality of cell voltage measurers into digital signals; and
a controller configured to control charging and discharging of the plurality of battery cells included in each of the cell groups according to the digital signals converted by the analog/digital converter, wherein each of the cell voltage measurers includes a capacitor and is configured to;
charge a voltage of a first battery cell among the plurality of battery cells of a corresponding one of the cell groups to the capacitor;
transmit a voltage charged to the capacitor by the first battery cell to the analog/digital converter;
charge a voltage of a second battery cell among the plurality of battery cells of a corresponding one of the cell groups to the capacitor while the voltage of the first battery cell is held in the capacitor; and
transmit a voltage charged to the capacitor by the second battery cell to the analog/digital converter. - View Dependent Claims (17, 18, 19, 20)
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21. A battery system comprising:
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a battery having a plurality of battery cells coupled in series, the plurality of battery cells including a first battery cell and a second battery cell; and
a battery management system, wherein the battery management system includes a cell voltage measurer configured to;
measure a capacitor voltage charged to a capacitor after the capacitor is charged by the first battery cell with a first battery voltage, and measure the capacitor voltage after the capacitor is charged by the second battery cell with a second battery voltage, the capacitor being charged by the second battery cell while the capacitor holds a capacitor voltage equal to the first battery voltage. - View Dependent Claims (22, 23, 24, 25, 26, 27)
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Specification