State value for rechargeable batteries
A state value for a rechargeable battery, for example a lithium-ion battery, is determined on the basis of several aging characteristic variables. The aging characteristic variables comprise at least one current aging value and one future aging value.
1. A method for ascertaining a state value in connection with aging of a rechargeable battery, where the method comprises:
ascertaining a current aging value of the battery,
ascertaining a future aging value of the battery by means of an aging model and based on the current aging value,
ascertaining the state value of the battery based on several aging characteristic variables which comprise at least the current aging value and the future aging value,
selecting a specific application scenario depending on a comparison of several future aging values, and
installing the battery or at least one cell of the battery into a device which is selected depending on the selection of the specific application scenario, where different application scenarios are associated with different devices.
2. The method as claimed in claim 1 ,
wherein the future aging value comprises a calendric and/or cyclic range of values of one or more performance characteristic variables of the battery,
where the method further comprises:
determining a distance from an end-of-life criterion of the battery, based on an analysis of the range of values for identifying a signature of the one or more performance characteristic variables of the battery, which signature corresponds to the end-of-life criterion,
wherein the several aging characteristic variables comprise the distance from the end-of-life criterion.
3. The method as claimed in claim 2 ,
where the signature comprises a sudden decrease in at least one of the one or more performance characteristic variables.
4. The method as claimed in claim 2 ,
where the signature comprises a decrease in or overshooting of at least one of the one or more performance characteristic variables to below or above a threshold value,
where the method further comprises:
determining the threshold value depending on an anticipated load profile or an anticipated application scenario of the battery.
5. The method as claimed in claim 1 , where the method further comprises:
detecting a historical load profile of the battery, and
determining an anticipated load profile of the battery based on the historical load profile of the battery,
wherein the aging model predicts the future aging value based on the anticipated load profile.
6. The method as claimed in claim 1 ,
where the aging model ascertains several future aging values based on several anticipated load profiles,
wherein the several anticipated load profiles correspond to several application scenarios,
where the several application scenarios are selected from the following group: static energy store in a microgrid; energy store for mobile applications; low-load energy store; energy store for light electric vehicles; energy store for electric passenger cars; indoor application; and outdoor application.
7. The method as claimed in claim 6 ,
where the current aging value, the future aging value and the state value are each determined for each of several battery cells of the battery,
where different application scenarios are taken into consideration for different battery cells.
8. The method as claimed in claim 6 , where the method further comprises:
selecting one or more future aging values as aging characteristic variables for ascertaining the state value based on a comparison of the several future aging values.
9. The method as claimed in claim 1 , where the method further comprises:
detecting historical load profiles of a battery ensemble with a large number of batteries of the same type and/or batteries in the same application scenario, and
determining an anticipated load profile of the battery based on the historical load profiles of the battery ensemble.
10. The method as claimed in claim 9 , which further comprises:
parameterizing the aging model based on calendric and/or cycled ranges of values of one or more performance characteristic variables of the batteries of the battery ensemble.
11. The method as claimed in claim 1 , which further comprises:
detecting a historical load profile of the battery,
wherein the aging characteristic variables further comprise the historical load profile of the battery.
12. The method as claimed in claim 11 ,
wherein the historical load profile of the battery comprises calendric and/or cycled ranges of values of one or more performance characteristic variables of the batteries, and/or
wherein the historical load profile of the battery indicates events in the case of which one or more performance characteristic variables lie in at least one prespecified region, and/or
wherein the historical load profile of the battery comprises aggregated performance characteristic variables of the battery.
13. The method as claimed in claim 12 ,
where the at least one prespecified region is associated with irreversible lithium deposition on an electrode of the battery.
14. The method as claimed in claim 1 ,
where the state value is ascertained based on a combination of the several aging characteristic variables,
where the method further comprises:
determining combination weights of the combination based on the current aging value and the future aging value.
15. The method as claimed in claim 1 , where the method further comprises:
comparing the state value with a large number of reference state values of further batteries of the same type, and
emitting a warning depending on the comparison.
16. An apparatus comprising a processor and a memory, where the processor is designed to load program code from the memory and to execute it, where executing the program code causes the processor to execute:
ascertaining a current aging value of the battery,
ascertaining a future aging value of the battery by means of an aging model and based on the current aging value,
ascertaining a state value of the battery based on several aging characteristic variables which comprise at least the current aging value and the future aging value,
selecting a specific application scenario from several application scenarios depending on a comparison of several future aging values, and
selecting a device into which the battery is to be installed, the selection depending on the selection of the specific application scenario, where different application scenarios are associated with different devices.
17. A method for ascertaining a state value in connection with aging of a rechargeable battery, where the method comprises:
ascertaining a current aging value of the battery,
ascertaining a future aging value of the battery by means of an aging model and based on the current aging value, and
ascertaining the state value of the battery based on several aging characteristic variables which comprise at least the current aging value and the future aging value,
selecting a specific application scenario from the several application scenarios depending on a comparison of the several future aging values, and
installing the battery or at least one cell of the battery into a device which is selected depending on the selection of the specific application scenario, where different application scenarios are associated with different devices,
wherein the aging model ascertains several future aging values based on several anticipated load profiles,
wherein the several anticipated load profiles correspond to several application scenarios, and
where the several application scenarios are selected from the following group: static energy store in a microgrid; energy store for mobile applications; low-load energy store; energy store for light electric vehicles; energy store for electric passenger cars; indoor application; and outdoor application.