Hybrid Battery Health Model Using Reference Electrode Potential
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Solution Overview
Problem
Existing methods for determining the state of health of electric vehicle batteries based on internal resistance are inconsistent due to device-specific definitions, leading to varying information on battery health across different manufacturers and customers.
Innovation Solution
A hybrid state-of-health model combining an electrochemical ageing model and a data-based correction model, along with an adaptation model, is used to determine the internal-resistance based state of health. This model accounts for operating parameters and internal states, and adjusts for device-specific internal resistance definitions by simulating battery voltage and adapting internal states based on reference data.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If device-specific internal resistance definitions are used, then the state of health determination can be customized for specific devices, but the determination results become inconsistent across different manufacturers and customers
Solution Approach 1:
The patent introduces a standardized reference electrode potential as an intermediary that mediates between device-specific internal resistance definitions and consistent state of health determination. By referencing all measurements to a common standard (reference electrode potential), the system allows different device configurations while maintaining determination consistency across manufacturers and customers.
2Ease of manufacture
If different determination rules are applied for internal resistance, then device-specific optimization is achieved, but the information on battery health becomes heavily dependent on the specific rule used
Solution Approach 1:
The patent changes the reference parameter from device-specific internal resistance values to a universal reference electrode potential. This parameter change allows determination rules to be optimized for specific devices while expressing all results in terms of the same reference parameter, thereby preserving comparability of battery health information across different devices and manufacturers.
3Reliability
If a universal state of health model is used, then consistency across devices is improved, but device-specific characteristics and specifications cannot be adequately accounted for
Solution Approach 1:
The patent creates a universal state of health determination framework based on reference electrode potential that can serve multiple device types simultaneously. The universal reference standard allows the same determination model to be applied across different devices while the model can incorporate device-specific parameters and characteristics, achieving both consistency and adaptability.
Data Source
AI summary
A method for determining an internal-resistance based state-of-health of a battery in a device includes determining the internal-resistance based state-of-health of the battery using a hybrid state-of-health model including a physical ageing model and a correction model by (i) determining, based on an electrochemical battery model, a physical state-of-health according to one or more operating parameters of the battery using the physical ageing model, (ii) mapping operating features derived from the one or more operating parameters onto a correction parameter using the correction model that includes a data-based configuration, and (iii) applying the correction parameter to the physical state of health to determine the internal-resistance based state-of-health. The method further includes determining a modeled battery voltage, and determining a characteristic of the modeled battery voltage using an adaptation model.