Extended battery diagnosis in traction batteries
First Claim
1. A method for ascertaining properties of a battery, such as a capacity and/or a charge state and/or a remaining life of the battery, by means of a model-based state identification, comprising the steps of:
- interrogating an operating state of a consumer supplied by the battery;
performing a process for ascertaining the properties of the battery based at least in part on the operating state of the consumer indicated by the interrogation, the properties including at least a capacity of the battery; and
starting the process for ascertaining an ascertainment of the properties of the battery only whenever the operating state of the consumer being supplied indicates that the consumer is not operating in a primary mode of operation,wherein for ascertaining the capacity of the battery, the following steps are performed;
switching at least one cell of the battery to a first defined charge state;
discharging or charging the at least one cell of the battery from the first defined charge state to a second defined charge state, and during the discharging or charging, a charge withdrawn from or supplied to the at least one cell is determined; and
ascertaining the capacity of the battery based on the determined charge withdrawn from or supplied to the at least one cell.
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Accused Products
Abstract
The invention relates to a method and a device for determining the properties of a battery, in particular a traction battery. Particularly the invention determines a battery state such as the capacity and/or a charging state and/or a remaining service life of the battery, preferably with an observer and a battery model for a model-based state identification. According to the invention, a querying module for querying an operational state of a consumer supplied by a battery and a first control module for starting the determination of the properties of the battery, only when the operational state of the supplied consumer shows that it does not operate in the principal mode, are provided.
18 Citations
19 Claims
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1. A method for ascertaining properties of a battery, such as a capacity and/or a charge state and/or a remaining life of the battery, by means of a model-based state identification, comprising the steps of:
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interrogating an operating state of a consumer supplied by the battery; performing a process for ascertaining the properties of the battery based at least in part on the operating state of the consumer indicated by the interrogation, the properties including at least a capacity of the battery; and starting the process for ascertaining an ascertainment of the properties of the battery only whenever the operating state of the consumer being supplied indicates that the consumer is not operating in a primary mode of operation, wherein for ascertaining the capacity of the battery, the following steps are performed; switching at least one cell of the battery to a first defined charge state; discharging or charging the at least one cell of the battery from the first defined charge state to a second defined charge state, and during the discharging or charging, a charge withdrawn from or supplied to the at least one cell is determined; and ascertaining the capacity of the battery based on the determined charge withdrawn from or supplied to the at least one cell. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. An apparatus for ascertaining properties of a battery, such as a capacity and/or a charge state and/or a remaining life of the battery, with an observer and a battery model for a model-based state identification, comprising:
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an interrogation module for interrogating an operating state of a consumer being supplied by the battery; a first control module for indicating when to start a process for ascertaining the properties of the battery, the first control module being configured to indicate that the process for ascertaining the properties is to be started only whenever the operating state of the consumer being supplied by the battery indicates that the consumer is not operating in a primary mode of operation; and a second control module for switching at least one cell of the battery to a first defined charge state and for discharging or charging the at least one cell of the battery from the first defined charge state to a second defined charge state when the first control module indicates when to start the process for ascertaining the properties of the battery; a charge measurement module for determining a charge withdrawn from or supplied to the cell; and a capacity-determining module for ascertaining the capacity of the battery based on a determined charge withdrawn from or supplied to the at least one cell. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18, 19)
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Specification