BATTERY CONTROL DEVICE AND BATTERY SYSTEM
First Claim
1. A battery control device comprising:
- a control unit which controls a battery pack having a plurality of single cells connected therein;
a voltage measurement unit which measures voltage between terminals of the single cells or the battery pack;
a current measurement unit which measures a current flowing through the single cells or the battery pack;
a temperature measurement unit which measures a temperature of the single cells or the battery pack, anda storage unit which stores internal resistance characteristic information indicative of correspondence relation between the temperature, state of charge, and internal resistance value of the single cells on one hand, and duration time during which the single cells are charged or discharged on the other hand, whereinthe internal resistance characteristic information describes the correspondence relation regarding each of the duration time;
whereinthe control unit acquires the state of charge of the single cells by using the result of the measurement by the voltage measurement unit and by the current measurement unit;
whereinusing the duration time that differs between an operation mode in to which to supply power to an electric vehicle and an operation mode in which to supply power to a hybrid electric vehicle, the control unit acquires the internal resistance value corresponding to the temperature, state of charge, and duration time of the single cells from the internal resistance characteristic information, and whereinthe control unit uses an upper or lower voltage, an open circuit voltage, and the internal resistance value of the single cells to calculate a charging current or a discharging current of the single cells, the control unit further performing a control to charge or discharge the single cells in accordance with the charging current or the discharging current.
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Accused Products
Abstract
An object of the invention is to provide a battery control apparatus capable of accurately obtaining permissible charging or discharging power in keeping with variation of the internal resistance of a battery. The battery control apparatus of this invention includes an internal resistance table in which the internal resistance value of single cells corresponding to the temperature and state of charge thereof are described in association with each of charging or discharging duration time of the single cells. The battery control apparatus calculates a permissible charging current or a permissible discharging current by using the internal resistance value described in the internal resistance table and controls the charging or discharging of the single cells in accordance with the current value thus obtained.
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Citations
11 Claims
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1. A battery control device comprising:
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a control unit which controls a battery pack having a plurality of single cells connected therein; a voltage measurement unit which measures voltage between terminals of the single cells or the battery pack; a current measurement unit which measures a current flowing through the single cells or the battery pack; a temperature measurement unit which measures a temperature of the single cells or the battery pack, and a storage unit which stores internal resistance characteristic information indicative of correspondence relation between the temperature, state of charge, and internal resistance value of the single cells on one hand, and duration time during which the single cells are charged or discharged on the other hand, wherein the internal resistance characteristic information describes the correspondence relation regarding each of the duration time;
whereinthe control unit acquires the state of charge of the single cells by using the result of the measurement by the voltage measurement unit and by the current measurement unit;
whereinusing the duration time that differs between an operation mode in to which to supply power to an electric vehicle and an operation mode in which to supply power to a hybrid electric vehicle, the control unit acquires the internal resistance value corresponding to the temperature, state of charge, and duration time of the single cells from the internal resistance characteristic information, and wherein the control unit uses an upper or lower voltage, an open circuit voltage, and the internal resistance value of the single cells to calculate a charging current or a discharging current of the single cells, the control unit further performing a control to charge or discharge the single cells in accordance with the charging current or the discharging current. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A battery control device comprising:
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a control unit which controls a battery pack having a plurality of single cells connected therein; a voltage measurement unit which measures voltage between terminals of the single cells or the battery pack; a current measurement unit which measures a current flowing through the single cells or the battery pack; a temperature measurement unit which measures a temperature of the single cells or the battery pack, and a storage unit which stores internal resistance characteristic information indicative of correspondence relation between the temperature, state of charge, and internal resistance value of the single cells;
whereinthe control unit acquires the state of charge of the single cells by using the result of the measurement by the voltage measurement unit and by the current measurement unit;
whereinthe control unit acquires the internal resistance value corresponding to the temperature and the state of charge of the single cells from the internal resistance characteristic information;
whereinthe control unit uses an upper or lower voltage, an open circuit voltage, and the internal resistance value of each of the single cells to calculate the charging current or discharging current of the single cells, the control unit further determining the smallest of the charging currents or of the discharging currents to be a definitive permissible current;
whereineither the sum of the voltage developed by each of the single cells when the single sells are supplied with the definitive permissible current, or the result of multiplying the number of serially connected single cells by an average obtained of the voltage developed by the single cells when the single sells are supplied with the definitive permissible current, the control unit further determining the sum or the result of the multiplication to be the voltage developed by the battery pack when the battery pack is supplied with the definitive permissible current, and wherein the control unit obtains permissible power by multiplying the definitive permissible current by the voltage developed by the battery pack when the battery pack is supplied with the definitive permissible current. - View Dependent Claims (11)
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Specification