Process for determining the state of a battery
First Claim
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1. A process for determining the state of a battery comprising:
- controlling a charging/discharging device to place the battery in a specific charging state in which an instantaneous terminal voltage Uact is equal to a predeterminable reference value Uref2 ;
generating a first signal when the battery has reached the specific charging state;
controlling the charging/discharging device as a function of the first signal such that, during a specific time period t1, a specific current I1 flows, the direction of the specific current I1 corresponding to a discharging operation;
generating a second signal which controls the charging/discharging device such that a specific current I2, the direction of the specific current I2 corresponding to a charging operation, flows for a time period t2 until the battery is again in the specific charging state;
measuring the time period t2, during which the specific current I2 flows; and
providing measured data fed to an evaluation unit in which an order of magnitude of the conversion of electrical energy into heat energy is deduced from a deviation of the time t2 from the time t1.
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Abstract
A process for determining the state of a battery by carrying out in a cycle, starting from a specific charging state of the battery, a charging operation and a discharging operation, each with a specific current, the cycle being terminated when the specific charging state is reached again, and the state of the battery being deduced from the difference between the time periods required for the charging operation and the discharging operation. Alternatively, from a specific charging state of the battery a discharge can be carried out, in order to determine the available capacity from the extracted charge.
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Citations
24 Claims
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1. A process for determining the state of a battery comprising:
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controlling a charging/discharging device to place the battery in a specific charging state in which an instantaneous terminal voltage Uact is equal to a predeterminable reference value Uref2 ; generating a first signal when the battery has reached the specific charging state; controlling the charging/discharging device as a function of the first signal such that, during a specific time period t1, a specific current I1 flows, the direction of the specific current I1 corresponding to a discharging operation; generating a second signal which controls the charging/discharging device such that a specific current I2, the direction of the specific current I2 corresponding to a charging operation, flows for a time period t2 until the battery is again in the specific charging state; measuring the time period t2, during which the specific current I2 flows; and providing measured data fed to an evaluation unit in which an order of magnitude of the conversion of electrical energy into heat energy is deduced from a deviation of the time t2 from the time t1. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A process for determining the state of a battery comprising:
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controlling a charging/discharging device to place the battery in a specific charging state in which an instantaneous terminal voltage Uact is equal to a predeterminable reference value Uref2 ; generating a first signal when the battery has reached the specific charging state; controlling the charging/discharging device as a function of the first signal such that, during a specific time period t1, a specific current I1 flows, the direction of the specific current I1 corresponding to a charging operation; generating a second signal which controls the charging/discharging device such that a specific current I2, the direction of the specific current I2 corresponding to a discharging operation, flows for a time period t2 until the battery is again in the specific charging state such that the instantaneous terminal voltage Uact is equal to the predeterminable reference value Uref2 ; measuring the time period t2, during which the specific current I2 flows; and providing measured data fed to an evaluation unit in which an order of magnitude of the conversion of electrical energy into heat energy is deduced from a deviation of the time t2 from the time t1. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
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19. A process for determining the state of a battery, the battery being initially in a state I in which the battery has a final charging voltage at its terminals, comprising:
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generating a signal that controls a charging/discharging device to change the battery from state I to a state II by a first discharge current ISE for a time period tSE, the battery in state II having a final discharge voltage UES at its terminals, and the first discharge current ISE being clearly above a rated current Irat of the battery; measuring the time period tSE during which the discharge current ISE flows; feeding measured data to an evaluation unit; determining in the evaluation unit a capacity Qreal of the battery by multiplying the first discharge current ISE by the time period tSE, and deducing a state of the battery from a deviation of the specific capacity Qreal from a rated capacity Qrat ; controlling the charging/discharging device, after the changeover of the battery to the state II by the first discharge current ISE flowing during the time period tSE, for a time period delay tdelay, such that neither a charging or a discharging current flows; controlling the charging/discharging device, after the time period tdelay, such that a second discharge current INE flows for a time period tNE until the battery returns to the state II; measuring the time period tNE during which the current INE flows; feeding the measured data to the evaluation unit and calculating the specific capacity Qreal by adding the product INE *tNE to the product ISE *tSE. - View Dependent Claims (20, 21, 22, 23, 24)
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Specification