Battery module voltage control device, battery module, and power supply system
First Claim
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1. A battery module voltage control device comprising:
- a voltage control unit connected between a load and a secondary battery and configured to control a discharge voltage of the secondary battery to an output voltage target value for a voltage to be outputted to the load, and to output the discharge voltage to the load; and
an output current value acquisition unit configured to acquire a value of an output current of a converter unit that is configured to perform constant voltage control for outputting a predetermined constant voltage to the load when the value of the output current is equal to or lower than a predetermined value,wherein the voltage control unit is configured to set the output voltage target value such that, when the acquired value of the output current is equal to or higher than a first threshold that is lower than the predetermined value, the output voltage target value increases with increase of the output current until the output voltage target value exceeds a value of the predetermined constant voltage of the converter unit, and, when the acquired value of the output current is between the first threshold and a second threshold, which is greater than the first threshold and lower than the predetermined value, the output voltage target value exceeds the value of the predetermined constant voltage of the converter unit.
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Abstract
A power supply system including a battery module and a converter unit. The system includes a bidirectional DC-DC converter as a component of a battery module voltage control device that is connected between a load and a secondary battery and that changes a discharge voltage of the secondary battery and outputs the discharge voltage to the load. Moreover, a voltage control unit, which can include a control unit and the bidirectional DC-DC converter, changes the discharge voltage of the secondary battery to an output voltage target value to be outputted to the load.
93 Citations
20 Claims
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1. A battery module voltage control device comprising:
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a voltage control unit connected between a load and a secondary battery and configured to control a discharge voltage of the secondary battery to an output voltage target value for a voltage to be outputted to the load, and to output the discharge voltage to the load; and an output current value acquisition unit configured to acquire a value of an output current of a converter unit that is configured to perform constant voltage control for outputting a predetermined constant voltage to the load when the value of the output current is equal to or lower than a predetermined value, wherein the voltage control unit is configured to set the output voltage target value such that, when the acquired value of the output current is equal to or higher than a first threshold that is lower than the predetermined value, the output voltage target value increases with increase of the output current until the output voltage target value exceeds a value of the predetermined constant voltage of the converter unit, and, when the acquired value of the output current is between the first threshold and a second threshold, which is greater than the first threshold and lower than the predetermined value, the output voltage target value exceeds the value of the predetermined constant voltage of the converter unit. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A battery module comprising:
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a secondary battery; a voltage control unit connected between a load and the secondary battery and configured to control a discharge voltage of the secondary battery to an output voltage target value for a voltage to be outputted to the load, and to output the discharge voltage to the load; and an output current value acquisition unit configured to acquire a value of an output current of a converter unit that is configured to perform constant voltage control for outputting a predetermined constant voltage to the load when the value of the output current is equal to or lower than a predetermined value, wherein the voltage control unit is configured to set the output voltage target value such that, when the acquired value of the output current is equal to or higher than a first threshold that is lower than the predetermined value, the output voltage target value increases with increase of the output current until the output voltage target value exceeds a value of the predetermined constant voltage of the converter unit, and, when the acquired value of the output current is between the first threshold and a second threshold, which is greater than the first threshold and lower than the predetermined value, the output voltage target value exceeds the value of the predetermined constant voltage of the converter unit. - View Dependent Claims (8, 9, 10, 11, 12)
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13. A power supply system comprising:
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a converter unit configured to perform constant voltage control for outputting a predetermined constant voltage to a load when an output current is equal to or lower than a predetermined value; a secondary battery; a voltage control unit connected between the load and the secondary battery and configured to control a discharge voltage of the secondary battery to an output voltage target value for a voltage to be outputted to the load, and to output the discharge voltage to the load; and an output current value acquisition unit configured to acquire a value of an output current value of the converter unit, wherein the voltage control unit is configured to set the output voltage target value such that, when the acquired value of the output current is equal to or higher than a first threshold that is lower than the predetermined value, the output voltage target value increases with increase of the output current until the output voltage target value exceeds a value of the predetermined constant voltage of the converter unit, and, when the acquired value of the output current is between the first threshold and a second threshold, which is greater than the first threshold and lower than the predetermined value, the output voltage target value exceeds the value of the predetermined constant voltage of the converter unit. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20)
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Specification