Charging/discharging control device and method for canceling memory effect in secondary battery
First Claim
1. A charging/discharging control device, comprising:
- a secondary battery formed of a battery assembly with a plurality of cells combined with one another;
a memory effect determinator for determining whether a discharging memory effect has occurred, based on at least one of the following determinations;
whether a time of charging/discharging of the secondary battery has reached a predetermined time;
whether a charging/discharging amount in the secondary battery has reached a predetermined amount; and
whether a voltage per cell of the plurality of cells has reached a voltage V1 at a lower-limit state of charge in a range of capacity actually used; and
a discharging controller for discharging the secondary battery until the voltage per cell reaches a voltage V3 that is higher than 1.0 V and is lower than the voltage V1 at the lower-limit state of charge when the memory effect determinator determines that the discharging memory effect has occurred.
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Accused Products
Abstract
A device and a method are provided in which memory effects can be cancelled by controlling charging and discharging of a secondary battery during driving of a vehicle. When a memory effect determinator determines that the discharging memory effect has occurred, based on at least one of the following determinations: whether a time of charging/discharging of a secondary battery has reached a predetermined time; whether a charging/discharging amount in the secondary battery has reached a predetermined amount; and whether a voltage per cell has reached a voltage V1 at a lower-limit state of charge in a range of capacity actually used, a discharging controller discharges the secondary battery until the voltage per cell reaches a voltage V3 that is higher than 1.0 V and is lower than the voltage V1 at the lower-limit state of charge.
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Citations
28 Claims
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1. A charging/discharging control device, comprising:
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a secondary battery formed of a battery assembly with a plurality of cells combined with one another;
a memory effect determinator for determining whether a discharging memory effect has occurred, based on at least one of the following determinations;
whether a time of charging/discharging of the secondary battery has reached a predetermined time;
whether a charging/discharging amount in the secondary battery has reached a predetermined amount; and
whether a voltage per cell of the plurality of cells has reached a voltage V1 at a lower-limit state of charge in a range of capacity actually used; and
a discharging controller for discharging the secondary battery until the voltage per cell reaches a voltage V3 that is higher than 1.0 V and is lower than the voltage V1 at the lower-limit state of charge when the memory effect determinator determines that the discharging memory effect has occurred. - View Dependent Claims (2, 3, 4)
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5. A charging/discharging control device, comprising:
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a secondary battery formed of a battery assembly with a plurality of cells combined with one another;
a memory effect determinator for determining whether a discharging memory effect has occurred, based on at least one of the following determinations;
whether a time of charging/discharging of the secondary battery has reached a predetermined time;
whether a charging/discharging amount in the secondary battery has reached a predetermined amount; and
whether a voltage per cell of the plurality of cells has reached a voltage V1 at a lower-limit state of charge in a range of capacity actually used; and
a discharging controller for discharging the secondary battery for a predetermined amount from the lower-limit state of charge when the memory effect determinator determines that the discharging memory effect has occurred. - View Dependent Claims (6, 7, 8)
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9. A charging/discharging control device, comprising:
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a secondary battery formed of a battery assembly with a plurality of cells combined with one another;
a memory effect determinator for determining whether a charging memory effect has occurred, based on at least one of the following determinations;
whether a time of charging/discharging of the secondary battery has reached a predetermined time;
whether a charging/discharging amount in the secondary battery has reached a predetermined amount; and
whether a voltage per cell of the plurality of cells has reached a voltage V2 at an upper-limit state of charge in a range of capacity actually used; and
a charging controller for charging the secondary battery until the voltage per cell reaches a voltage V4 that is higher than the voltage V2 at the upper-limit state of charge when the memory effect determinator determines that the charging memory effect has occurred. - View Dependent Claims (10, 11)
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12. A charging/discharging control device, comprising:
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a secondary battery formed of a battery assembly with a plurality of cells combined with one another;
a memory effect determinator for determining whether a charging memory effect has occurred, based on at least one of the following determinations;
whether a time of charging/discharging of the secondary battery has reached a predetermined time;
whether a charging/discharging amount in the secondary battery has reached a predetermined amount; and
whether a voltage per cell of the plurality of cells has reached a voltage V2 at an upper-limit state of charge in a range of capacity actually used; and
a charging controller for charging the secondary battery for a predetermined amount from the upper-limit state of charge when the memory effect determinator determines that the charging memory effect has occurred. - View Dependent Claims (13, 14)
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15. A charging/discharging control method, comprising:
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determining whether a discharging memory effect has occurred, based on at least one of the following determinations;
whether a time of charging/discharging of a secondary battery formed of a battery assembly with a plurality of cells combined with one another has reached a predetermined time;
whether a charging/discharging amount in the secondary battery has reached a predetermined amount; and
whether a voltage per cell of the plurality of cells has reached a voltage V1 at a lower-limit state of charge in a range of capacity actually used; and
discharging the secondary battery until the voltage per cell reaches a voltage V3 that is higher than 1.0 V and is lower than the voltage V1 at the lower-limit state of charge when it is determined that the discharging memory effect has occurred. - View Dependent Claims (16, 17, 18)
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19. A charging/discharging control method, comprising:
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determining whether a discharging memory effect has occurred, based on at least one of the following determinations;
whether a time of charging/discharging of a secondary battery formed of a battery assembly with a plurality of cells combined with one another has reached a predetermined time;
whether a charging/discharging amount in the secondary battery has reached a predetermined amount; and
whether a voltage per cell of the plurality of cells has reached a voltage V1 at a lower-limit state of charge in a range of capacity actually used; and
discharging the secondary battery for a predetermined amount from the lower-limit state of charge when it is determined that the discharging memory effect has occurred. - View Dependent Claims (20, 21, 22)
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23. A charging/discharging control method, comprising:
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determining whether a charging memory effect has occurred, based on at least one of the following determinations;
whether a time of charging/discharging of a secondary battery formed of a battery assembly with a plurality of cells combined with one another has reached a predetermined time;
whether a charging/discharging amount in the secondary battery has reached a predetermined amount; and
whether a voltage per cell of the plurality of cells has reached a voltage V2 at an upper-limit state of charge in a range of capacity actually used; and
charging the secondary battery until the voltage per cell reaches a voltage V4 that is higher than the voltage V2 at the upper-limit state of charge when it is determined that the charging memory effect has occurred. - View Dependent Claims (24, 25)
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26. A charging/discharging control method, comprising:
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determining whether a charging memory effect has occurred, based on at least one of the following determinations;
whether a time of charging/discharging of a secondary battery formed of a battery assembly with a plurality of cells combined with one another has reached a predetermined time;
whether a charging/discharging amount in the secondary battery has reached a predetermined amount; and
whether a voltage per cell of the plurality of cells has reached a voltage V2 at an upper-limit state of charge in a range of capacity actually used; and
charging the secondary battery for a predetermined amount from the upper-limit state of charge when it is determined that the charging memory effect has occurred. - View Dependent Claims (27, 28)
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Specification