CONTROL APPARATUS AND CONTROL METHOD FOR SECONDARY BATTERY
First Claim
1. A control apparatus for a secondary battery mounted on a vehicle, comprising:
- a detection unit detecting a charging current value to said secondary battery and a discharging current value from said secondary battery; and
a control unit connected to said detection unit,said control unit storing a history of said charging current value and said discharging current value detected by said detection unit, presuming a change in unevenness of ion concentration in an electrolyte in said secondary battery based on said stored history, calculating an evaluation value related to deterioration of said secondary battery due to discharging to correspond to the change in said unevenness of the ion concentration, and controlling an upper limit value of discharging power from said secondary battery based on said calculated evaluation value,said control unit shifting said evaluation value to a deterioration side when it is presumed that said unevenness of the ion concentration is increased, shifting said evaluation value to a non-deterioration side when it is presumed that said unevenness of the ion concentration is reduced, and setting said upper limit value of the discharging power when said evaluation value shifts to the deterioration side beyond a target value predetermined to be able to avoid the deterioration of said secondary battery due to discharging, to be lower than said upper limit value of the discharging power when said evaluation value does not shift to the deterioration side beyond said target value.
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Accused Products
Abstract
An ECU calculates an evaluation value decrease amount D(−) in response to a reduction of unevenness of lithium ion concentration caused by diffusion of lithium ions resulting from a lapse of one cycle time ΔT, calculates an evaluation value increase amount D(+) in response to an increase of the unevenness of the lithium ion concentration caused by discharging during a lapse of one cycle time ΔT, and calculates a present value D(N) of a battery deterioration evaluation value D due to high-rate discharging, as a previous value D(N−1)−evaluation value decrease amount D(−)+evaluation value increase amount D(+). If battery deterioration evaluation value D exceeds a predetermined target value E, the ECU sets a discharging power limit value WOUT that is a limit value of electric power to be discharged from a battery, to a value lower than a maximum value W(MAX).
34 Citations
24 Claims
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1. A control apparatus for a secondary battery mounted on a vehicle, comprising:
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a detection unit detecting a charging current value to said secondary battery and a discharging current value from said secondary battery; and a control unit connected to said detection unit, said control unit storing a history of said charging current value and said discharging current value detected by said detection unit, presuming a change in unevenness of ion concentration in an electrolyte in said secondary battery based on said stored history, calculating an evaluation value related to deterioration of said secondary battery due to discharging to correspond to the change in said unevenness of the ion concentration, and controlling an upper limit value of discharging power from said secondary battery based on said calculated evaluation value, said control unit shifting said evaluation value to a deterioration side when it is presumed that said unevenness of the ion concentration is increased, shifting said evaluation value to a non-deterioration side when it is presumed that said unevenness of the ion concentration is reduced, and setting said upper limit value of the discharging power when said evaluation value shifts to the deterioration side beyond a target value predetermined to be able to avoid the deterioration of said secondary battery due to discharging, to be lower than said upper limit value of the discharging power when said evaluation value does not shift to the deterioration side beyond said target value. - View Dependent Claims (4, 5, 7, 8)
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2. (canceled)
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3. (canceled)
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6. (canceled)
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9. A control apparatus for a secondary battery mounted on a vehicle, comprising:
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means for detecting a charging current value to said secondary battery and a discharging current value from said secondary battery; means for storing a history of said charging current value and said discharging current value; calculation means for presuming a change in unevenness of ion concentration in an electrolyte in said secondary battery based on said history, and calculating an evaluation value related to deterioration of said secondary battery due to discharging to correspond to the change in said unevenness of the ion concentration; and control means for controlling an upper limit value of discharging power from said secondary battery based on said evaluation value, said calculation means shifting said evaluation value to a deterioration side when it is presumed that said unevenness of the ion concentration is increased, and shifting said evaluation value to a non-deterioration side when it is presumed that said unevenness of the ion concentration is reduced, said control means setting said upper limit value of the discharging power when said evaluation value shifts to the deterioration side beyond a target value predetermined to be able to avoid the deterioration of said secondary battery due to discharging, to be lower than said upper limit value of the discharging power when said evaluation value does not shift to the deterioration side beyond said target value. - View Dependent Claims (12, 13, 15, 16)
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10. (canceled)
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11. (canceled)
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14. (canceled)
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17. A control method for a secondary battery mounted on a vehicle, comprising:
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a step of detecting a charging current value to said secondary battery and a discharging current value from said secondary battery; a step of storing a history of said charging current value and said discharging current value; a calculation step of presuming a change in unevenness of ion concentration in an electrolyte in said secondary battery based on said history, and calculating an evaluation value related to deterioration of said secondary battery due to discharging to correspond to the change in said unevenness of the ion concentration; and a control step of controlling an upper limit value of discharging power from said secondary battery based on said evaluation value, said calculation step including a step of shifting said evaluation value to a deterioration side when it is presumed that said unevenness of the ion concentration is increased, and shifting said evaluation value to a non-deterioration side when it is presumed that said unevenness of the ion concentration is reduced, said control step including a step of setting said upper limit value of the discharging power when said evaluation value shifts to the deterioration side beyond a target value predetermined to be able to avoid the deterioration of said secondary battery due to discharging to be lower than said upper limit value of the discharging power when said evaluation value does not shift to the deterioration side beyond said target value. - View Dependent Claims (20, 21, 23, 24)
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18. (canceled)
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19. (canceled)
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22. (canceled)
Specification