Battery Charge Display Correction for Perceived Charging Speed
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Solution Overview
Problem
Users suspect a malfunction of the charger or product due to a charge stop period after full-charge, and existing battery charge display methods do not effectively improve the perceived charging speed or accurately represent the battery's state.
Innovation Solution
A battery management system that adjusts the charge threshold values based on battery deterioration and temperature, applying a correction rate to the indicated charge amount to maintain a full-charge display until the battery reaches a specific threshold, thereby preventing overcharging and resuming charging when necessary.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the battery charge amount is displayed in 1% units from 0%-100%, then the charge amount display precision is improved, but the user experiences charge stop period after full-charge which causes suspicion of malfunction
Solution Approach 1:
The patent changes the display parameter from actual charge amount to corrected charge amount, which is calculated by adding a predetermined value to the actual charge amount. This parameter transformation resolves the contradiction by maintaining precise display (showing increasing values) while preventing the full-charge stop issue, as the corrected charge amount continues to increase even when actual charging stops temporarily.
2Reliability
If charging is stopped when battery satisfies full-charge condition to prevent overcharge, then battery safety is improved, but perceived charging speed deteriorates due to charge stop period
Solution Approach 1:
The patent applies preliminary action by pre-calculating and displaying the corrected charge amount before actual charging completes. The predetermined value is added in advance to anticipate the charge amount, so the display shows continuous charging progress even when physical charging temporarily stops, thereby maintaining perceived charging speed while battery safety remains ensured through actual charging control.
Solution Approach 2:
The corrected charge amount acts as an intermediary between the actual charge amount and the user display. This intermediary value smooths out the discontinuities caused by charging stops, providing a continuous visual representation of charging progress that maintains perceived speed while the actual charging process continues to prioritize battery safety.
3Ease of operation
If the charge amount is displayed as 100% when battery is fully charged, then the ease of operation is improved, but the charge amount display accuracy deteriorates during charge stop period due to self-discharge
Solution Approach 1:
The patent transforms the display parameter from direct charge amount to corrected charge amount by adding a predetermined compensation value. This parameter change allows the display to maintain ease of operation (clear charging status) while improving accuracy during charge stop periods, as the predetermined value compensates for self-discharge effects and prevents the display from showing decreasing charge amounts during normal charging pauses.
Data Source
AI summary
A battery pack can include a battery and a battery management system for detecting a charge amount of the battery, setting an indicated charge amount as the charge amount if the charge amount of the battery is smaller than a first threshold value, and setting the indicated charge amount as that of the following equation 1 when the charge amount of the battery is greater than or equal to the first threshold value.Indicated charge amount=actual charge amount×correction rate=actual charge amount×(1+((100/second threshold value)−1)/(second threshold value−first threshold value)×(actual charge amount−first threshold value))), [Equation 1]wherein the actual charge amount is the charge amount of the battery.