POWER STORAGE SYSTEM AND POWER STORAGE METHOD
First Claim
1. A power storage system, comprising:
- a power generation element that performs environmental power generation;
a first storage battery that receives power generated by the power generation element and supplies the power to a load device;
a second storage battery that has a capacitance smaller than that of the first storage battery and is connected in series with the first storage battery;
a first switcher that is connected in parallel to the second storage battery, short-circuits both terminals of the second storage battery in a closed state, and releases a short-circuited state of the second storage battery in an open state; and
a switching unit that controls the opened and closed states of the first switcher, wherein the switching unitcompares a charging voltage of the first storage battery with a predetermined first threshold voltage when both terminals of the second storage battery are short-circuited by the first switcher and charging is performed from the first storage battery to the load device via the first switcher,performs control so that the first switcher enters an open state when the charging voltage of the first storage battery becomes equal to or lower than the predetermined first threshold voltage,determines the charging voltage of the entire series circuit of the first storage battery and the second storage battery or determines the charging voltage of a single entity of the second storage battery and sums the determined charging voltage and the charging voltage of the first storage battery to obtain the charging voltage of the entire series circuit when the short-circuited state of both terminals of the second storage battery is released by the first switcher and charging is performed from the power generation element to the series circuit, andperforms control so that the first switcher enters the closed state when the charging voltage of the entire series circuit becomes equal to or higher than a predetermined second threshold voltage that is higher than the first threshold voltage.
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Abstract
A power storage system includes a power generation element that performs environmental power generation, a first storage battery that receives power generated by the power generation element and supplies the power to a load device, a second storage battery that has a capacitance smaller than that of the first storage battery and is connected in series with the first storage battery, a first switcher that is connected in parallel to the second storage battery, short-circuits both terminals of the second storage battery in a closed state, and releases a short-circuited state of the second storage battery in an open state, and a switching unit that controls the opened and closed states of the first switcher.
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Citations
17 Claims
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1. A power storage system, comprising:
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a power generation element that performs environmental power generation; a first storage battery that receives power generated by the power generation element and supplies the power to a load device; a second storage battery that has a capacitance smaller than that of the first storage battery and is connected in series with the first storage battery; a first switcher that is connected in parallel to the second storage battery, short-circuits both terminals of the second storage battery in a closed state, and releases a short-circuited state of the second storage battery in an open state; and a switching unit that controls the opened and closed states of the first switcher, wherein the switching unit compares a charging voltage of the first storage battery with a predetermined first threshold voltage when both terminals of the second storage battery are short-circuited by the first switcher and charging is performed from the first storage battery to the load device via the first switcher, performs control so that the first switcher enters an open state when the charging voltage of the first storage battery becomes equal to or lower than the predetermined first threshold voltage, determines the charging voltage of the entire series circuit of the first storage battery and the second storage battery or determines the charging voltage of a single entity of the second storage battery and sums the determined charging voltage and the charging voltage of the first storage battery to obtain the charging voltage of the entire series circuit when the short-circuited state of both terminals of the second storage battery is released by the first switcher and charging is performed from the power generation element to the series circuit, and performs control so that the first switcher enters the closed state when the charging voltage of the entire series circuit becomes equal to or higher than a predetermined second threshold voltage that is higher than the first threshold voltage. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A power storage method in a power storage system comprising a power generation element that performs environmental power generation, a first storage battery that receives power generated by the power generation element and supplies the power to a load device, a second storage battery that has a capacitance smaller than that of the first storage battery and is connected in series with the first storage battery, a first switcher that is connected in parallel to the second storage battery, short-circuits both terminals of the second storage battery in a closed state, and releases a short-circuited state of the second storage battery in an open state, and a switching unit that controls the opened and closed states of the first switcher,
wherein the switching unit controls such that comparing a charging voltage of the first storage battery with a predetermined first threshold voltage when both terminals of the second storage battery are short-circuited by the first switcher and charging is performed from the first storage battery to the load device via the first switcher, performing control so that the first switcher enters an open state when the charging voltage of the first storage battery becomes equal to or lower than the predetermined first threshold voltage, determining the charging voltage of the entire series circuit or determines the charging voltage of a single entity of the second storage battery and sums the determined charging voltage and the charging voltage of the first storage battery to obtain the charging voltage of the entire series circuit when the short-circuited state of both terminals of the second storage battery is released by the first switcher and charging is performed from the power generation element to the series circuit of the first storage battery and the second storage battery, and performing control so that the first switcher enters the closed state when the charging voltage of the entire series circuit becomes equal to or higher than a predetermined second threshold voltage that is higher than the first threshold voltage.
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9. A power storage system, comprising:
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a power generation element that performs environmental power generation; a power supply line that supplies power to a load device; a first storage battery that is charged with power generated by the power generation element via the power supply line and supplies the power to the load device; a second storage battery that has a capacitance smaller than that of the first storage battery; a switcher that is selectively set to a parallel connection state in which the first storage battery and the second storage battery are connected in parallel between the power supply line and a ground and a series connection state in which the first storage battery and the second storage battery are connected in series between the power supply line and the ground; a voltage determinator that determines a voltage at which the first storage battery is over-discharged; and a switching unit that controls the switcher according to the determination voltage of the voltage determinator, wherein the switching unit has a first threshold voltage that is compared with a voltage when the determination voltage of the voltage determinator decreases, and a second threshold voltage that is compared with the voltage when the determination voltage of the voltage determinator increases, wherein the switching unit compares the determination voltage of the voltage determinator with a first threshold voltage when the switcher is set to the parallel connection state, and sets the switcher to the series connection state when the determination voltage of the voltage determinator becomes equal to or lower than the first threshold voltage, and wherein the switching unit compares the determination voltage of the voltage determinator with the second threshold voltage when the switcher is set to the series connection state, and sets the switcher to the parallel connection state when the determination voltage of the voltage determinator becomes equal to or higher than the voltage with the second threshold. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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17. A power storage method in a power storage system comprising a power generation element that performs environmental power generation, a power supply line that supplies power to a load device, a first storage battery that is charged with power generated by the power generation element via the power supply line and supplies the power to the load device, a second storage battery that has a capacitance smaller than that of the first storage battery, a switcher that is selectively set to a parallel connection state in which the first storage battery and the second storage battery are connected in parallel between the power supply line and a ground and a series connection state in which the first storage battery and the second storage battery are connected in series between the power supply line and the ground, a voltage determinator that determines a voltage at which the first storage battery is over-discharged, and a switching unit that controls the switcher according to the determination voltage of the voltage determinator,
wherein the switching unit has a first threshold voltage that is compared with a voltage when the determination voltage of the voltage determinator decreases, and a second threshold voltage that is compared with the voltage when the determination voltage of the voltage determinator increases, wherein the switching unit compares the determination voltage of the voltage determinator with the first threshold voltage when the switcher is set to the parallel connection state, and sets the switcher to the series connection state when the determination voltage of the voltage determinator becomes equal to or lower than the first threshold voltage, and wherein the switching unit compares the determination voltage of the voltage determinator with the second threshold voltage when the switcher is set to the series connection state, and sets the switcher to the parallel connection state when the determination voltage of the voltage determinator becomes equal to or higher than the voltage with the second threshold.
Specification