Discharging system and electric vehicle
First Claim
1. A discharging system comprising:
- a discharging section, connected to a battery block to be discharged among battery blocks forming a battery pack, for discharging the battery block to be discharged;
a discharge control unit connected in parallel with the discharging section to both ends of the battery block to be discharged, the discharge control unit is configured to operate from power supplied from the battery block to be discharged and to issue a command to the discharging section to discharge the battery block to be discharged in response to start of the power being supplied;
a discharge request section that measures the amount of variation of remaining capacity between battery blocks and starts power supply to the discharge control unit connected to the battery block to be discharged, if amount of variation of remaining capacity between battery blocks forming the battery pack is larger than a predetermined value with at least a battery block having the largest remaining capacity among the battery blocks as the battery block to be discharged;
a first switch in a line connecting the discharge control unit to the battery block to be discharged, wherein the switch is activated by the discharge request section; and
a second switch in the discharging section that is activated by the discharge control unit to allow current flow from the battery block to be discharged,wherein the discharge control unit includes a microprocessor that receives power from the battery block to be discharged when the first switch is activated, and the discharge control unit issues a command to the discharging section to stop discharging of the battery block to be discharged and further stops power supply from the battery block to be discharged if remaining capacity of the battery block to be discharged becomes less than a predetermined value.
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Accused Products
Abstract
The operation of a discharging apparatus for correcting variations in voltage and remaining capacity among battery blocks forming a battery pack is performed more reliably. When power supply from a battery pack to a motor/generator is not being performed and when a variation amount of remaining capacity among the battery blocks forming the battery pack is larger than a predetermined value, a discharge request section issues a command to start power supply from a battery block to a discharge control unit corresponding to at least a battery block having the largest remaining capacity among the battery blocks. The discharge control unit receives the start command for power supply from the battery block and issues a command to a discharging section to discharge the battery block in response to start of the power supply from the battery block.
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Citations
6 Claims
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1. A discharging system comprising:
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a discharging section, connected to a battery block to be discharged among battery blocks forming a battery pack, for discharging the battery block to be discharged; a discharge control unit connected in parallel with the discharging section to both ends of the battery block to be discharged, the discharge control unit is configured to operate from power supplied from the battery block to be discharged and to issue a command to the discharging section to discharge the battery block to be discharged in response to start of the power being supplied; a discharge request section that measures the amount of variation of remaining capacity between battery blocks and starts power supply to the discharge control unit connected to the battery block to be discharged, if amount of variation of remaining capacity between battery blocks forming the battery pack is larger than a predetermined value with at least a battery block having the largest remaining capacity among the battery blocks as the battery block to be discharged; a first switch in a line connecting the discharge control unit to the battery block to be discharged, wherein the switch is activated by the discharge request section; and a second switch in the discharging section that is activated by the discharge control unit to allow current flow from the battery block to be discharged, wherein the discharge control unit includes a microprocessor that receives power from the battery block to be discharged when the first switch is activated, and the discharge control unit issues a command to the discharging section to stop discharging of the battery block to be discharged and further stops power supply from the battery block to be discharged if remaining capacity of the battery block to be discharged becomes less than a predetermined value.
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2. A discharging system comprising:
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a discharging section, connected to a battery block to be discharged among battery blocks forming a battery pack, for discharging the battery block to be discharged; a discharge control unit connected in parallel with the discharging section to both ends of the battery block to be discharged, the discharge control unit is configured to operate from power supplied from the battery block to be discharged and to issue a command to the discharging section to discharge the battery block to be discharged in response to start of the power being supplied; a discharge request section that measures the amount of variation of remaining capacity between battery blocks and starts power supply to the discharge control unit connected to the battery block to be discharged if a battery block having a terminal voltage exceeding a predetermined first reference voltage is detected with at least the detected battery block as the battery block to be discharged; a first switch in a line connecting the discharge control unit to the battery block to be discharged, wherein the switch is activated by the discharge request section; and a second switch in the discharging section that is activated by the discharge control unit to allow current flow from the battery block to be discharged, wherein the discharge control unit includes a microprocessor that receives power from the battery block to be discharged when the first switch is activated, and the discharge control unit issues a command to the discharging section to stop discharging from the battery block to be discharged and further stops power supply from the battery block to be discharged if terminal voltage of the battery block to be discharged becomes smaller than a predetermined second reference voltage.
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3. An electric vehicle comprising:
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a motor/generator as a driving source; a battery pack composed from a plurality of battery blocks supplying power to the motor/generator; a discharging section connected to a battery block to be discharged from among the battery blocks composing the battery pack for performing discharge of the battery block to be discharged; a discharge control unit, connected in parallel with the discharging section to both ends of the battery block to be discharged, the discharge control unit is configured to operate from power supplied from the battery block to be discharged, and to issue a command to the discharging section to discharge the battery block to be discharged in response to start of the power being supplied; and a discharge request section that measures the amount of variation of remaining capacity between battery blocks and for judging discharge conditions are satisfied when power from the battery pack is not being supplied to the motor/generator and when a variation amount of remaining capacity among battery blocks composing the battery pack is larger than a predetermined value, and that starts power supply to the discharge control unit connected to the battery block to be discharged with at least a battery block having maximum remaining capacity among battery blocks as the battery block to be discharged; a first switch in a line connecting the discharge control unit to the battery block to be discharged, wherein the switch is activated by the discharge request section; and a second switch in the discharging section that is activated by the discharge control unit to allow current flow from the battery block to be discharged, wherein the discharge control unit issues a command to the discharging section to stop discharging of the battery block to be discharged and further stops power supply from the battery block to be discharged if remaining capacity of the battery block to be discharged becomes smaller than a predetermined reference value. - View Dependent Claims (5, 6)
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4. An electric vehicle comprising:
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a motor/generator as a driving source; a battery pack composed from a plurality of battery blocks supplying power to the motor/generator; a discharging section connected to a battery block to be discharged from among the battery blocks composing the battery pack for performing discharge of the battery block to be discharged; a discharge control unit, connected in parallel with the discharging section to both ends of the battery block to be discharged, the discharge control unit is configured to operate from power supplied from the battery block to be discharged, and to issue a command to the discharging section to discharge the battery block to be discharged in response to start of the power being supplied; and a discharge request section that measures the amount of variation of remaining capacity between battery blocks and for judging discharge conditions are satisfied when a power supply from the battery pack is not being performed to the motor/generator and when a battery block having terminal voltage exceeding a predetermined first reference voltage is detected, and that starts power supply to the discharge control unit connected to the battery block to be discharged with at least the detected battery block as the battery block to be discharged; a first switch in a line connecting the discharge control unit to the battery block to be discharged, wherein the switch is activated by the discharge request section; and a second switch in the discharging section that is activated by the discharge control unit to allow current flow from the battery block to be discharged, wherein the discharge control unit issues a command to the discharging section to stop discharging of the battery block to be discharged and further stops power supply from the battery block to be discharged.
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Specification