POWER SUPPLY SYSTEM, ELECTRIC VEHICLE PROVIDED WITH SAME, AND CONTROL METHOD OF POWER SUPPLY SYSTEM
First Claim
1. A power supply system comprising:
- a plurality of power storage devices;
a connecting device that is provided between the plurality of power storage devices and an electrical system that receives a supply of electric power from the plurality of power storage devices, and is structured to selectively electrically connect and disconnect the plurality of power storage devices to and from the electrical system; and
a control apparatus that sequentially selects one of the plurality of power storage devices, connects the selected power storage device to the electrical system, and controls the connecting device to disconnect the remaining power storage device from the electrical system,wherein the control apparatus includes a) a state-of-charge estimating portion that estimates the state-of-charge of each of the plurality of power storage devices, b) a determining portion that determines whether the state-of-charge of the power storage device that is connected to the electrical system by the connecting device has reached a first lower limit value, and c) a switch controlling portion that, when it is determined by the determining portion that the state-of-charge of the power storage device that is connected to the electrical system has reached the first lower limit value, controls the connecting device to disconnect the power storage device that is connected to the electrical system from the electrical system and connect one of the remaining power storage devices having a state-of-charge that has not reached the first lower limit value to the electrical system,wherein the state-of-charge estimating portion estimates the state-of-charge of the used power storage device, for which it has been determined that the state-of-charge has reached the first lower limit value and has thus been disconnected from the electrical system, based on an open circuit voltage of that power storage device, andwherein if the state-of-charge estimated based on the open circuit voltage of the used power storage device is higher than the first lower limit value, after the remaining power storage device has been used, the switching control portion controls the connecting device to connect the used power storage device to the electrical system again and disconnect the remaining power storage device from the electrical system, andwherein the switch controlling portion does not reconnect the used power storage device to the electrical system if the state-of-charge estimated based on the open circuit voltage of the used power storage device is equal to or lower than the first lower limit value.
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Accused Products
Abstract
When it is determined by a determining portion (54) that the SOC of a first auxiliary power storage device (BB1) has reached a first lower limit value (TL), a switching control portion (56) generates a switching signal (SW) to switch from the first auxiliary power storage device (BB1) to the second auxiliary power storage device (BB2). A SOC estimating portion (52) measures the OCV for the first auxiliary power storage device (BB1), for which it has been determined that the SOC has reached the first lower limit value (TL) and has thus been disconnected, and estimates the SOC of that first auxiliary power storage device (BB1), based on that measured OCV. If the estimated SOC is higher than the first lower limit value (TL), after the SOC of the second auxiliary power storage device (BB2) has reached the first lower limit value (TL), the switching control portion (56) generates a switching signal (SW) to switch from the second auxiliary power storage device (BB2) to the first auxiliary storage device (BB1).
35 Citations
13 Claims
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1. A power supply system comprising:
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a plurality of power storage devices; a connecting device that is provided between the plurality of power storage devices and an electrical system that receives a supply of electric power from the plurality of power storage devices, and is structured to selectively electrically connect and disconnect the plurality of power storage devices to and from the electrical system; and a control apparatus that sequentially selects one of the plurality of power storage devices, connects the selected power storage device to the electrical system, and controls the connecting device to disconnect the remaining power storage device from the electrical system, wherein the control apparatus includes a) a state-of-charge estimating portion that estimates the state-of-charge of each of the plurality of power storage devices, b) a determining portion that determines whether the state-of-charge of the power storage device that is connected to the electrical system by the connecting device has reached a first lower limit value, and c) a switch controlling portion that, when it is determined by the determining portion that the state-of-charge of the power storage device that is connected to the electrical system has reached the first lower limit value, controls the connecting device to disconnect the power storage device that is connected to the electrical system from the electrical system and connect one of the remaining power storage devices having a state-of-charge that has not reached the first lower limit value to the electrical system, wherein the state-of-charge estimating portion estimates the state-of-charge of the used power storage device, for which it has been determined that the state-of-charge has reached the first lower limit value and has thus been disconnected from the electrical system, based on an open circuit voltage of that power storage device, and wherein if the state-of-charge estimated based on the open circuit voltage of the used power storage device is higher than the first lower limit value, after the remaining power storage device has been used, the switching control portion controls the connecting device to connect the used power storage device to the electrical system again and disconnect the remaining power storage device from the electrical system, and wherein the switch controlling portion does not reconnect the used power storage device to the electrical system if the state-of-charge estimated based on the open circuit voltage of the used power storage device is equal to or lower than the first lower limit value. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A control method of a power supply system that includes a plurality of power storage devices, and a connecting device that is provided between the plurality of power storage devices and an electrical system that receives a supply of electric power from the plurality of power storage devices, and is structured to selectively electrically connect and disconnect the plurality of power storage devices to and from the electrical system, comprising:
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determining whether a state-of-charge of the power storage device, that is connected to the electrical system has reached a first lower limit value; controlling the connecting device to disconnect the power storage device that is connected to the electrical system from the electrical system and connect one of the remaining power storage devices having a state-of-charge that has not reached the first lower limit value to the electrical system, when it is determined that the state-of-charge of the power storage device that is connected to the electrical system has reached the first lower limit value; estimating the state-of-charge of the used power storage device, for which it has been determined that the state-of-charge has reached the first lower limit value and has thus been disconnected from the electrical system, based on an open circuit voltage of that power storage device; and controlling the connecting device to connect the used power storage device to the electrical system again and disconnect the remaining power storage device from the electrical system after the remaining power storage device has been used, when the state-of-charge estimated based on the open circuit voltage of the used power storage device is higher than the first lower limit value controlling the connecting device not to reconnect the used power storage device to the electrical system if the state-of-change estimated based on the open circuit voltage of the used power storage device is equal to or lower than the first lower limit value. - View Dependent Claims (9, 10, 11, 12, 13)
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Specification