Battery management device, energy storage apparatus, battery management method, and computer program
AssigneeGS Yuasa International Ltd.
InventorSeiji Takai
Life of this patent
Estimating the term…
Abstract
A battery management device manages an energy storage device to which a shunt resistor is connected. The battery management device includes: a current measurement unit that measures a current flowing through the shunt resistor using a pair of signal wires connected to both ends of the shunt resistor; a connecting wire that connects the signal wire to a reference potential source via an opening/closing switch; and a determination unit that determines presence or absence of a failure in which connection between the pair of signal wires via the shunt resistor becomes defective based on a change in current measured by the current measurement unit when the opening/closing switch is opened and closed.
Claims10
A battery management device that manages an energy storage device to which a shunt resistor is connected, the battery management device comprising:
- a current measurement unit that measures a current flowing through the shunt resistor using a pair of signal wires connected to both ends of the shunt resistor;
- a connecting wire that connects the signal wire to a reference potential source via an opening/closing switch;
- and
- a determination unit that determines presence or absence of a failure in which connection between the pair of signal wires via the shunt resistor becomes defective based on a change in current measured by the current measurement unit when the opening/closing switch is opened and closed,
- wherein the reference potential source is a ground,
- wherein the current measurement unit measures a voltage between the pair of signal wires and measures a current based on the voltage,
- wherein the pair of connecting wires are connected to the pair of signal wires via a resistor having a resistance higher than a resistance of the shunt resistor, and
- wherein the determination unit determines that the failure has occurred when a current measured by the current measurement unit approaches 0 in a state where the opening/closing switch is closed as compared with a current measured by the current measurement unit in a state where the opening/closing switch is open.
An energy storage apparatus comprising:
- an energy storage device;
- a shunt resistor connected to the energy storage device;
- and a battery management device that manages the energy storage device,
- wherein the battery management device includes:
- a current measurement unit that measures a current flowing through the shunt resistor using a pair of signal wires connected to both ends of the shunt resistor;
- a connecting wire that connects the signal wire to a reference potential source via an opening/closing switch;
- and
- a determination unit that determines presence or absence of a failure in which connection between the pair of signal wires via the shunt resistor becomes defective based on a change in current measured by the current measurement unit when the opening/closing switch is opened and closed.
A battery management method for managing an energy storage device to which a shunt resistor is connected, the battery management method comprising determining, using a current measurement unit that measures a current flowing through the shunt resistor using a pair of signal wires connected to both ends of the shunt resistor, and a connecting wire that connects the signal wire to a reference potential source via an opening/closing switch, presence or absence of a failure in which connection between the pair of signal wires via the shunt resistor becomes defective based on a change in current measured by the current measurement unit when the opening/closing switch is opened and closed.
A computer program that causes a computer to execute a process for managing an energy storage device using a current measurement unit that measures a current flowing through the shunt resistor using a pair of signal wires connected to both ends of the shunt resistor connected to the energy storage device, and a connecting wire that connects the signal wire to a reference potential source via an opening/closing switch,
- wherein the computer program causes the computer to execute:
- opening and closing the opening/closing switch;
- and
- determining presence or absence of a failure in which connection between the pair of signal wires via the shunt resistor becomes defective based on a change in current measured by the current measurement unit when the opening/closing switch is opened and closed.
Dependencies are inferred from the claim text.