METHOD FOR PROTECTING A BATTERY DEVICE

Abstract

The invention relates to a method for protecting a battery device (100), in particular an electrode of the battery device (100), having the following steps: determining at least one electrical battery parameter (EBP) of the battery device (100), determining an operating parameter (BP) of an operating current (IB) of the battery device, calculating a disturbance parameter (SP) for a disturbance current (IS) on the basis of the operating parameter (BP), generating the disturbance current (IS), and applying the disturbance current (IS) to the operating current (IB).

Claims

1. Method for protecting a battery device (100), in particular an electrode of the battery device (100), having the following steps: determining at least one electrical battery parameter (EBP) of the battery device (100), determining an operating parameter (BP) of an operating current (IB) of the battery device, calculating a disturbance parameter (SP) for a disturbance current (IS) on the basis of the operating parameter (BP), generating the disturbance current (IS), applying the disturbance current (IS) to the operating current (IB).

2. Method according to claim 1, characterised in that the disturbance parameter (SP) differs from the operating parameter (BP) and in particular comprises one of the following current parameters: current amplitude current frequency.

3. Method according to claim 1, characterised in that the at least one operating parameter (BP) and/or the at least one battery parameter (EBP) is determined on the basis of at least one measured sensor value.

4. Method according to claim 1, characterised in that the at least one operating parameter (BP) and/or the at least one battery parameter (EBP) is, at least partially, determined on the basis of a simulation model (110).

5. Method according to claim 1, characterised in that the disturbance parameter (SP) has a current frequency of the disturbance current (IS) which is in particular less or substantially less than 1 kHz.

6. Method according to claim 1, characterised in that a comparison of the real impedance and the imaginary impedance of the battery device (100) is carried out for the calculation of the disturbance parameter (SP).

7. Method according to claim 6, characterised in that, during the comparison, a range of a local minimum, in particular in the form a current frequency, is selected for the calculation of the disturbance parameter (SP).

8. Method according to claim 6, characterised in that an impedance curve (IK) specific to the determined battery parameter (EBP) and/or the determined operating parameter (BP) is used for the comparison of the real impedance with the imaginary impedance of the battery device (100).

9. Method according to claim 1, characterised in that at least one absolute limit is adhered to when calculating the disturbance parameter (SP).

10. Method according to claim 9, characterised in that half, in particular a third of the present current amplitude of the operating current (IB) is used as absolute limit for a disturbance parameter (SP) in the form of a current amplitude as upper limit.

11. Method according to claim 1, characterised in that at least one electrical secondary component (130) with its own current demand is inserted in the circuit of the battery device (100) to generate the disturbance current (IS).

12. Method according to claim 11, characterised in that an inverter in the circuit of the battery device (100) is used as secondary component (130).

13. Method according to claim 11, characterised in that at least two secondary components (130) are, at least at times, used in parallel, in time, in order to generate the disturbance current (IS).

14. Method according to claim 13, characterised in that the at least two secondary components (130) are operated with synchronous or substantially synchronous disturbance current (IS).

15. Method according to claim 13, characterised in that the at least two secondary components (130) are operated with asynchronous or substantially asynchronous disturbance current (IS).

16. Checking device (10) for checking a battery device (100), comprising a determining module (20) for determining at least one electrical battery parameter (EBP) of the battery device (100) and for determining an operating parameter (BP) of an operating current (IB) of the battery device, a calculating module (30) for calculating a disturbance parameter (SP) for a disturbance current (IS) on the basis of the operating parameter (BP), a generating module (40) for generating the disturbance current (IS) and an application module (50) for applying the disturbance current (IS) to the operating current (IB).

17. Checking device (10) according to claim 16, characterised in that the determining module (20), the calculating module (30), the generating module (40) and/or the application module (50) are designed for the implementation of a method having the following steps: determining at least one electrical battery parameter (EBP) of the battery device (100), determining an operating parameter (BP) of an operating current (IB) of the battery device, calculating a disturbance parameter (SP) for a disturbance current (IS) on the basis of the operating parameter (BP), generating the disturbance current (IS), applying the disturbance current (IS) to the operating current (IB).

18. Computer program product comprising commands which, when the program is run on a computer, cause this to carry out the method with the features of claim 1.

Description

[0040] Further advantages, features and details of the invention are explained in the following description, in which exemplary embodiments of the invention are described in detail with reference to the drawings. In each case schematically:

[0041] FIG. 1 shows an embodiment of a battery device according to the invention

[0042] FIG. 2 shows a situation with operating current,

[0043] FIG. 3 shows a situation with disturbance current,

[0044] FIG. 4 shows an embodiment of a checking device according to the invention and

[0045] FIG. 5 shows a possibility of an impedance curve,

[0046] FIG. 1 shows, schematically, a vehicle as an example of use of a battery device 100. The battery device 100 has numerous individual battery cells, each of which is equipped with two electrodes. Depending on which operating mode the vehicle and thus also the battery device 100 is in, the battery device 100 can be assigned a battery parameter EBP. For example, this can be a charging state, a discharging state, a current state of charge (SOC) or for example an ageing condition (state of health SOH). For the monitoring of the battery device 100, a checking device 10 is shown here schematically, as well as at least one secondary component 130 in the circuit of the battery device 100. The secondary component 130 can be an electrical consumer, for example in the form of an inverter for the battery device 100.

[0047] FIGS. 2 and 3 show, schematically, the fundamental concepts behind the functioning of a method according to the invention. Starting from the battery device 100 shown in FIG. 1, a determining step can now be carried out with the checking device 10. In a first step, the determining module 20, as shown for example in FIG. 4, will now determine the electrical battery parameter EBP of the battery device 100. This is followed by a determining step for the operating parameter BP or at least one operating parameter BP of the operating current IB. This is shown schematically in FIG. 2. FIG. 2 shows a period of a current frequency of the operating current IB. In this case the operating current IB can have operating parameters BP, in particular with regard to two current parameters.

[0048] This is, on the one hand, half the amplitude size in the positive sense of the operating current IB. The frequency, i.e. the length of a period of the operating current IB, is also shown here schematically as the operating parameter BP. One or both or even further combinations of current parameters of the operating current IB can now be determined by the determining module 20 and serve as a basis for the further method.

[0049] FIG. 3 shows how a disturbance parameter SP is provided on the basis of the operating current IB and the determined operating parameter BP. In this embodiment, this generation of the disturbance parameter SP is based on a generation of different current parameters in comparison to the operating current B. In the example in FIG. 3, this leads to a larger amplitude being generated as the first disturbance parameter SP and a shorter frequency or length of the period being generated as the second disturbance parameter SP. On the basis of these two disturbance parameters SP, a disturbance current IS according to FIG. 3 can be generated which is then applied to the operating current according to FIG. 2. If the current situation according to FIG. 2 is now combined with the current situation according to FIG. 3, a relation current or a combination current is established which has the desired disharmonious effects on the respective electrode of the battery device 100, so that the corresponding protective effect can be achieved from a chemical and/or physical point of view. In addition to the embodiment shown in FIGS. 2 and 3, it would naturally also be sufficient in principle to change only a single form of the current parameter, or of a single current parameter, between the operating current 18 and the disturbance current IS.

[0050] FIG. 4 shows, schematically, the embodiment of a checking device 10. In order to ensure the individual steps of determining, calculating, generating and application, the checking device 10 is equipped here with a determining module 20, a calculating module 30, a generating module 40 as well as an application module 50. A simulation model 110 as well as a sensor device 120 are in addition provided here as input variables and/or for use during the individual method steps.

[0051] One possibility for the selection of a corresponding disturbance parameter SP is the use of an impedance curve IK as shown in FIG. 5. Here, the real impedance is correlated with the imaginary impedance of the battery device 100. As can be seen clearly from FIG. 5, two local minimums are formed here which are preferred ranges for the selection of the disturbance parameter SP. In particular, the impedance curve IK (not shown in FIG. 5) is coupled with corresponding frequency ranges, so that, on the basis of the selection of the local minimum, a corresponding frequency range can also be selected as disturbance parameter SP for the disturbance current IS.

[0052] The above explanation of the embodiments describes the present invention exclusively in the context of examples. Naturally, individual features of the embodiments can, where technically expedient, be freely combined with one another without departing from the scope of the present invention.

REFERENCE SIGNS

[0053] 10 checking device

[0054] 20 determining module

[0055] 30 calculating module

[0056] 40 generating module

[0057] 50 application module

[0058] 100 battery device

[0059] 110 simulation model

[0060] 120 sensor device

[0061] 130 secondary component

[0062] EBP battery parameter

[0063] BP operating parameter

[0064] IB operating current

[0065] SP disturbance parameter

[0066] IS disturbance current

[0067] IK impedance curve