Method and device for device-specific determination of internal resistance-based battery aging state
A technology of aging state and internal state, applied in battery circuit devices, battery/fuel cell control devices, measuring electricity, etc., can solve problems such as storage capacity decline and reduction
Pending Publication Date: 2022-04-12
ROBERT BOSCH GMBH
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- Application Information
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Problems solved by technology
The aging state of vehicle batteries decreases significantly over the course of their service life, which leads to a decrease in maximum storage capacity
Method used
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Embodiment Construction
[0027] figure 1 A schematic block diagram of an aging state model 1 is shown for providing a device-specific internal resistance-based aging state SOHR corresponding to an individual calculation specification for one or more internal resistances.
[0028] The aging state model 1 is constructed in a hybrid manner and basically has a physical aging model 2 that provides the physical aging state. For this purpose, the course of the operating variables of the battery, ie the course of the battery current I, the battery voltage U, the battery temperature T and the state of charge SOC, are used as input variables. The physical aging model 2 is implemented as an electrochemical cell model and describes the corresponding electrochemical states Z1, Z2, Z3... with the aid of differential equations, such as layer thickness (e.g. SEI thickness), Changes in cyclizable lithium, fast consumption of electrolyte, slow consumption of electrolyte, loss of active material in anode, loss of activ...
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The invention relates to a method for determining an internal resistance-based aging state of a battery in a device, comprising the following steps: determining an internal resistance-based aging state by means of a hybrid aging state model, the hybrid aging state model comprising a physical aging model and a correction model, wherein the physical aging model is configured on the basis of the electrochemical cell model to provide a physical aging state dependent on one or more operating variables of the cell, and wherein the correction model is configured in a data-based manner to map operating characteristics derived from the one or more operating variables as correction variables, wherein a correction variable is applied to the physical aging state to determine an internal resistance-based aging state; the process of change of the modeled battery voltage is determined by means of an adaptation model modeled as a function of the internal state of the physical aging model and as a function of the process of change of the at least one battery current, and the modeled battery voltage is supplied to the physical aging model in order to determine the physical aging state as a function of the modeled battery voltage.
Description
technical field [0001] The invention relates to batteries, in particular batteries for electrically propellable motor vehicles, and also to measures for determining the state of aging based on the rate of change of internal resistance according to customer specifications, manufacturer specifications or device specifications. Background technique [0002] Electrically propellable motor vehicles are typically powered by the vehicle battery. The aging state of a vehicle battery decreases significantly over the course of its service life, which leads to a decrease in maximum storage capacity. The degree of aging of the vehicle battery depends on the individual loads on the vehicle battery. [0003] In the case of batteries, the state of aging is a key variable that describes the remaining battery capacity or remaining battery charge. The aging state is how old the battery has been since it was put into operation (Begin of Life). The aging state can be described as capacity re...
Claims
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Patent Timeline
Login to View More IPC IPC(8): G01R31/392G01R31/389G01R31/3842
CPCG01R31/367G01R31/389G01R31/392Y02T10/70H02J7/005B60L58/16B60L2240/547B60L2260/42B60L2240/545B60L2200/10B60L2200/12
Inventor C·克勒纳C·西莫尼斯T·许尔辛
Owner ROBERT BOSCH GMBH