Battery Controller Verifies State of Health Probability
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Solution Overview
Problem
The accuracy of State of Health (SOH) calculations in battery systems for electric vehicles is not reliably diagnosed, leading to potential inaccurate warnings for battery replacement.
Innovation Solution
A battery controller calculates measurement parameters for State of Charge (SOC) and SOH, and diagnoses their probabilities by comparing measurement values, ensuring accurate assessment and notification for battery replacement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If SOH is calculated using current integration method and compared with threshold, then battery replacement warning can be issued, but the accuracy/probability of the calculation result cannot be verified
Solution Approach 1:
The patent implements feedback by comparing the calculated SOH value with measurement values obtained from actual battery tests. The system performs verification tests on the battery and uses the test results to validate whether the calculated SOH accurately reflects the actual battery state, thereby verifying the probability/accuracy of the calculation result before issuing replacement warnings
Solution Approach 2:
The system performs self-verification by conducting its own battery tests and using the results to validate its own calculation algorithms. The battery controller automatically tests the battery characteristics and compares them with calculated values to assess the accuracy of SOH calculations without requiring external verification
2Ease of operation
If warning lamp is lit based on calculated SOH threshold comparison, then user is notified for battery replacement, but false warnings may occur due to inaccurate SOH calculation
Solution Approach 1:
The system uses feedback from actual battery measurement values to verify calculated SOH before triggering warnings. By comparing calculated SOH with empirically measured values from battery tests, the system reduces false warnings and ensures that replacement notifications are based on accurate assessments of actual battery degradation
Data Source
AI summary
Provided is a battery control device which can verify a probability of a state of charge or a state of health of a battery. A battery controller according to the invention calculates a measurement parameter of the battery using the state of charge or the state of health of the battery, and the probability of the state of charge or the state of health is diagnosed by comparing the measurement results (see FIGS. 9(a) and 9(b)).