High-Voltage Battery Health Assessment via Static and Dynamic Data Bus Testing
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Solution Overview
Problem
Existing methods for evaluating the state of health of high-voltage batteries in hybrid vehicles are inadequate, leading to increased fuel consumption and premature replacement or vehicle upgrades due to unnoticed battery degradation, as they fail to provide early and precise assessments of battery capacity and performance.
Innovation Solution
A method that analyzes the high-voltage battery via the vehicle's data bus, incorporating static and dynamic tests to evaluate differential voltages, capacity, and internal resistances, comparing these values to reference data from new batteries to determine the overall state of health, allowing for early detection of battery issues.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If battery health assessment is performed using existing methods, then battery evaluation can be conducted, but early and precise detection of battery degradation is not achieved, leading to increased fuel consumption and premature replacement
Solution Approach 1:
The battery assessment is divided into two distinct phases: a static assessment phase that evaluates baseline battery characteristics, and a dynamic assessment phase that evaluates battery performance under load. This segmentation allows for more precise detection of degradation patterns by comparing static and dynamic parameters, enabling earlier and more accurate identification of battery health issues before they lead to premature replacement decisions
Solution Approach 2:
The method performs preliminary battery assessments during regular vehicle operation using the data bus, before significant degradation occurs. By continuously monitoring and comparing battery parameters against reference values from new batteries, the system enables early detection of capacity loss and performance degradation, allowing owners to plan battery replacement at optimal times rather than experiencing unexpected failures that increase fuel consumption
2Measurement precision
If battery assessment requires removing the battery from the vehicle, then detailed testing can be performed, but the assessment process becomes complex and time-consuming
Solution Approach 1:
The assessment system utilizes the vehicle's existing data bus infrastructure to perform battery evaluations, making the system universal and compatible with various vehicle platforms without requiring specialized external equipment. The method leverages already-present sensors and communication systems to extract battery parameters, thereby reducing device complexity while maintaining measurement precision through multi-functional use of existing vehicle components
Solution Approach 2:
The battery assessment system uses the vehicle's own data bus and existing sensor network to perform self-diagnosis and health evaluation. By utilizing the vehicle's inherent communication infrastructure and powertrain control unit data, the system eliminates the need for complex external testing equipment, reducing overall system complexity while enabling precise measurement of battery parameters during normal operation
3Reliability
If comprehensive battery testing is performed, then accurate health assessment is achieved, but the testing process requires battery removal and extensive procedures
Solution Approach 1:
The assessment method transitions from static battery evaluation to dynamic assessment during actual vehicle operation. By evaluating battery parameters under varying load conditions, driving cycles, and operational states through the data bus, the system achieves reliable health assessment that reflects real-world performance. This dynamic approach maintains high reliability while dramatically improving ease of operation, as the battery remains installed and the assessment occurs during normal driving without requiring complex removal and reinstallation procedures
Data Source
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AI summary
Method for assessing the state of health of a high-voltage battery (20) of a hybrid vehicle (10) in its installed state, comprising the steps of: - establishing a connection between a tester (50) and a battery control unit (30), - verifying that specified test conditions (200) are met, - performing a static test sequence (300) whereby at least one static battery parameter is determined, - performing a dynamic test sequence (400) whereby at least one dynamic battery parameter is determined, - calculating the overall state of health of the high-voltage battery (20) from the at least one static battery parameter and the at least one dynamic battery parameter