Control for battery pack
First Claim
1. A battery control apparatus comprising:
- a battery pack including a series combination of cell units;
a motor drive control circuit to receive a discharge current from the battery pack to drive a traction motor of a vehicle, and to supply a charge current to the battery pack;
a current sensor to sense a discharge/charge current flowing from the battery pack as the discharge current and flowing to the battery pack as the charge current;
a voltage detecting circuit to sense a voltage between two separate points in the series combination of the cell unit of the battery pack;
a reference voltage drop memory section to store a reference voltage drop quantity representing a decrease in voltage during a predetermined time interval between the two separate points in a reference state;
an offset detecting section to compare an actual voltage drop quantity which is a decrease in voltage during the predetermined time interval between the two separate points, sensed by the voltage detecting circuit, with the reference voltage drop quantity stored in the reference voltage drop memory section, to detect a non-discharge/charge-current state of the current sensor in accordance with a result of comparison between the actual voltage drop quantity and the reference voltage drop quantity, and to reserve an output of the current sensor, as an offset quantity when the non-discharge/charge current state is detected; and
a correcting section to correct a sensed value of the discharge/charge current sensed by the current sensor, in accordance with the offset quantity reserved by the offset detecting section.
1 Assignment
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Accused Products
Abstract
A battery pack of a series combination of cell units is connected with a motor drive control circuit to drive a traction motor for a vehicle. A current sensor senses a discharge/charge current of the battery pack, and a voltage detecting circuit senses a voltage between two separate points in the series combination of the battery pack. A memory section stores a reference voltage drop quantity representing a decrease in voltage during a predetermined time interval between the two separate points. An offset detecting section compares an actual voltage drop quantity sensed by the voltage detecting circuit, with the reference voltage drop quantity, thereby detects a non-discharge/charge-current state of the current sensor, and reserves an output of the current sensor, as an offset quantity upon the detection. A correcting section corrects a sensed value of the discharge/charge current with the reserved offset quantity.
50 Citations
11 Claims
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1. A battery control apparatus comprising:
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a battery pack including a series combination of cell units; a motor drive control circuit to receive a discharge current from the battery pack to drive a traction motor of a vehicle, and to supply a charge current to the battery pack; a current sensor to sense a discharge/charge current flowing from the battery pack as the discharge current and flowing to the battery pack as the charge current; a voltage detecting circuit to sense a voltage between two separate points in the series combination of the cell unit of the battery pack; a reference voltage drop memory section to store a reference voltage drop quantity representing a decrease in voltage during a predetermined time interval between the two separate points in a reference state; an offset detecting section to compare an actual voltage drop quantity which is a decrease in voltage during the predetermined time interval between the two separate points, sensed by the voltage detecting circuit, with the reference voltage drop quantity stored in the reference voltage drop memory section, to detect a non-discharge/charge-current state of the current sensor in accordance with a result of comparison between the actual voltage drop quantity and the reference voltage drop quantity, and to reserve an output of the current sensor, as an offset quantity when the non-discharge/charge current state is detected; and a correcting section to correct a sensed value of the discharge/charge current sensed by the current sensor, in accordance with the offset quantity reserved by the offset detecting section. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A battery control apparatus comprising:
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a battery pack including a series combination of cell units; a motor drive control circuit to receive a discharge current from the battery pack to drive a traction motor of a vehicle, and supply a charge current to the battery pack; a current sensor to sense a discharge/charge current of the battery pack which is one of the discharge current and the charge current; a voltage detecting circuit to sense a voltage between two separate points in the series combination of the cell units of the battery pack; means for storing a reference voltage drop quantity representing a decrease in voltage during a predetermined time interval between the two separate points; means for comparing an actual voltage drop quantity which is a decrease in voltage during the predetermined time interval between the two separate points, sensed by the voltage detecting circuit, with the reference voltage drop quantity, and for detecting a non-discharge/charge current state in accordance with a result of comparison between the actual voltage drop quantity and the reference voltage drop quantity; means for storing, as an offset quantity, an output of the current sensor obtained when the non-discharge/charge-current state is detected; and means for correcting a sensed value of the discharge/charge current sensed by the current sensor, in accordance with the offset quantity.
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11. A battery control process for a battery system of a battery pack including a series combination of cell units, and a motor drive control circuit to receive a discharge current from the battery pack to drive a traction motor of a vehicle, and supply a charge current to the battery pack, the battery control process comprising:
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sensing a voltage between two separate points in the series combination of the cell units of the battery pack to determine an actual voltage drop quantity during a predetermined time interval; comparing the actual voltage drop quantity with a preliminarily stored reference voltage drop quantity, to judge a non-discharge/charge-current state to be present in accordance with a result of comparison between the actual voltage drop quantity and the reference voltage drop quantity; reserving, as an offset quantity, a sensed value of a discharge/charge current when the non-discharge/charge-current state is present; and determining a corrected current value by subtracting the offset quantity from the sensed value of the discharge/charge current.
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Specification