Dynamic Charging Cut-off Voltage Adjustment for Battery Safety
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Solution Overview
Problem
Conventional battery charging methods, particularly in the constant voltage stage, result in extended charging times due to low charging currents and voltage cut-offs, which hinder efficient battery charging.
Innovation Solution
A charging control method that dynamically adjusts the charging cut-off voltage by increasing it initially and then decreasing it when the battery voltage exceeds a safety threshold, while periodically monitoring charging current and voltage, to enhance charging efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the charging cut-off voltage is kept at a predetermined level during constant voltage charging, then battery safety is ensured, but charging current remains low and charging time is extended
Solution Approach 1:
The charging cut-off voltage is changed from a static predetermined value to a dynamic adjusted value. During constant voltage charging, when the battery voltage exceeds the safety voltage, the charging module adjusts the charging cut-off voltage from the predetermined value to a higher adjusted value, enabling higher charging current and faster charging while maintaining safety through periodic voltage monitoring
Solution Approach 2:
The charging cut-off voltage parameter is dynamically changed during the charging process. The system transitions from using a fixed predetermined charging cut-off voltage to using an adjusted charging cut-off voltage that is higher than the predetermined value, thereby increasing charging current and reducing charging time while maintaining battery safety through continuous monitoring
2Productivity
If the charging cut-off voltage is increased to reduce charging time, then charging efficiency improves, but battery safety may be compromised
Solution Approach 1:
The system implements feedback control by periodically detecting the battery voltage during charging. When the battery voltage exceeds the safety voltage, the system adjusts the charging cut-off voltage to a higher value to improve charging efficiency. The feedback loop continues to monitor battery voltage and will adjust or stop charging when safety thresholds are approached, thus maintaining battery safety while improving charging efficiency
Solution Approach 2:
The charging cut-off voltage is dynamically adjusted based on real-time battery voltage detection. The system transitions from a static predetermined voltage to a dynamic adjusted voltage that responds to battery state, allowing higher voltages for faster charging when safe, and automatically reducing or stopping when safety thresholds are reached
Data Source
AI summary
A charging control method, a charging control device and a terminal are provided. According to the charging control method, it is determined whether the present charging stage is the constant voltage charging stage. The predetermined charging cut-off voltage is increased to the first charging cut-off voltage if the present charging stage is the constant voltage charging stage. The charging current and the battery voltage are periodically detected at a predetermined time interval. The first charging cut-off voltage is decreased by the predetermined voltage adjustment magnitude when the charging current is greater than or equal to the predetermined threshold and the battery voltage is greater than or equal to the safety voltage. The charging is completed when the charging current is less than the predetermined threshold.