Flash Fast Charging Voltage Detection for Battery Saturation
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Solution Overview
Problem
The existing flash fast charging (FFC) algorithm for terminals leads to overvoltage charging, which increases internal resistance with battery aging, preventing the battery from reaching a saturated charging state and reducing standby performance.
Innovation Solution
A method that detects the charging voltage during FFC, determines when to end the FFC, records the standing duration, and applies a preset safe current when the duration exceeds a threshold, allowing for continued charging with a small current to ensure full battery saturation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If FFC algorithm increases charging cut-off current for overvoltage charging, then charging speed is improved and constant-voltage stage is shortened, but battery internal resistance increases with aging and float voltage increases, preventing battery from reaching saturated charging state
Solution Approach 1:
The patent dynamically adjusts the charging cut-off current based on battery aging state. For new batteries, a higher cut-off current is used to enable fast charging, while for aged batteries, the cut-off current is reduced to allow the battery to reach saturated charging state despite longer charging time. This dynamic adjustment resolves the contradiction between charging speed and charging completeness.
Solution Approach 2:
The patent changes the charging parameters (cut-off current, charging voltage thresholds) based on battery aging characteristics. By monitoring battery voltage and current characteristics during charging, the system identifies aging batteries and adjusts the charging parameters accordingly, enabling aged batteries to reach full saturation while maintaining reasonable charging speed for new batteries.
2Loss of time
If FFC algorithm omits constant-voltage charging stage, then charging time is reduced, but battery cannot reach saturated charging state due to increased float voltage from aging
Solution Approach 1:
The patent dynamically determines whether to omit the constant-voltage stage based on battery aging detection. For new batteries, the constant-voltage stage is omitted to reduce charging time. For aged batteries, the system extends the constant-voltage stage or adjusts charging parameters to ensure the battery reaches saturated charging state, thus adapting the charging strategy to battery condition.
Solution Approach 2:
The patent uses feedback from battery voltage and current monitoring during charging to determine if the battery is aging. Based on this feedback, the system adjusts the charging strategy - either omitting the constant-voltage stage for new batteries or maintaining/extending it for aged batteries to ensure complete charging.
Data Source
AI summary
Provided are a charging method, a terminal, and a non-transitory computer storage medium. The method includes the following. A charging voltage is detected in applying flash fast charging (FFC) to a terminal. Whether to end the FFC is determined according to the charging voltage. FFC is ended and a standing duration is recorded, where the standing duration is indicative of time which has elapsed after charging of a terminal is ended. A preset safe current is applied to the terminal, when the standing duration is longer than or equal to a preset threshold duration.