Battery Charge-Based Remaining Capacity Estimation Accuracy Control
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Solution Overview
Problem
Existing battery remaining quantity estimation apparatuses face accuracy issues in estimating the remaining capacity of secondary batteries when the rate of change of voltage during charging becomes maximum, due to deviations caused by charging parameter changes and capacity unevenness.
Innovation Solution
A battery remaining quantity estimation apparatus that estimates the remaining quantity of a secondary battery based on a charging parameter correlated with charging time and the rate of change of voltage, by determining whether a predetermined condition of limited charging parameter change is met, and estimating the remaining quantity corresponding to a portion between two minimum values of the rate of change of voltage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the remaining quantity is estimated based on the singular point where the rate of change of voltage becomes maximum, then the estimation process is simple, but the estimation accuracy decreases due to charging parameter changes and capacity unevenness
Solution Approach 1:
The patent applies preliminary action by checking whether the charging parameter change from the start of charging until the singular point is within a predetermined amount before performing the estimation. This preliminary verification ensures that the estimation is only conducted under conditions where accuracy is maintained, preventing inaccurate estimations due to excessive charging parameter changes or capacity unevenness.
2Productivity
If the estimation is performed without checking charging parameter changes, then the estimation can be performed continuously, but the accuracy decreases when charging parameter changes exceed predetermined limits
Solution Approach 1:
The patent implements feedback by continuously monitoring the charging parameter changes and comparing them against predetermined thresholds. The estimation process is dynamically controlled based on this feedback - when the charging parameter change is within the predetermined amount, estimation is performed; when it exceeds the limit, estimation is withheld. This feedback mechanism ensures high productivity through continuous monitoring while maintaining accuracy by conditionally performing estimations.
Data Source
AI summary
A battery remaining quantity estimation apparatus estimates a remaining quantity of a secondary battery based on a charging parameter correlated with charging time of the secondary battery and a rate of change of a voltage of the secondary battery relative to the charging parameter. This estimation apparatus determines whether a predetermined condition is met. The predetermined condition is that an amount of change in the charging parameter from the start of charging of the secondary battery until when the rate of change of the voltage becomes a maximum value is equal to or less than a predetermined amount of change. In response to determining that the predetermined condition is met, the estimation apparatus estimates a remaining quantity corresponding to a portion between two minimum values of the rate of change of the voltage during charging of the secondary battery as the remaining quantity of the secondary battery.