Battery Floating Charging Control for Overcharge Safety
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Solution Overview
Problem
Electronic devices that remain connected to a charger for extended periods after full charge can lead to battery bulging, expansion, and explosion in high-temperature environments due to prolonged high-voltage charging.
Innovation Solution
A battery charging method that determines if a charging cycle satisfies a floating charging condition based on battery capacity and duration, switching to a floating charging mode with a reduced voltage to prevent such hazards.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the battery is charged using high voltage continuously after full charge, then the charging speed is fast and the battery capacity is quickly restored, but the battery safety deteriorates and risks of bulging, expansion and explosion increase
Solution Approach 1:
The patent applies dynamics by making the charging voltage adjustable rather than fixed. The charging circuit switches between high voltage mode (for fast charging when battery is not full) and low voltage mode (for safety when battery is full). This dynamic adjustment of charging parameters resolves the contradiction between charging speed and battery safety by adapting the voltage level to the current charging state and temperature conditions
Solution Approach 2:
The patent changes the charging voltage parameter based on battery state and temperature. When the battery reaches full charge or when temperature exceeds thresholds, the system transitions from high voltage charging to low voltage floating charging. This parameter change ensures fast charging during the main charging phase while preventing safety issues during the floating charging phase, thus resolving the contradiction between productivity and reliability
2Ease of operation
If the device remains connected to the charger for a long time after full charge, then the battery maintains a ready state for quick use, but the battery safety deteriorates due to prolonged high-voltage floating charge
Solution Approach 1:
The system dynamically adjusts charging voltage based on the charging phase. During the initial charging phase, high voltage is applied for fast charging. Once the battery reaches full charge, the system automatically switches to low voltage floating charge mode, maintaining the battery in a ready state while minimizing safety risks associated with prolonged connection to the charger
3Use of energy by moving object
If high voltage charging is applied continuously, then the charging efficiency is high and the battery is quickly recharged, but the temperature increases and battery safety deteriorates
Solution Approach 1:
The patent implements periodic action by alternating between high voltage charging phases (for efficiency) and low voltage floating charging phases (for temperature control). The system monitors temperature and charging state, switching between charging modes at appropriate intervals. This periodic switching maintains high charging efficiency during the main charging phase while preventing excessive temperature rise during the floating charging phase
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Prevents battery bulging, expansion, and explosion by reducing charging voltage when the device is fully charged and continuously connected, enhancing safety and preventing dangerous situations.
Implementation Method 1
constant-voltage charging the battery with a first charging voltage, the first charging voltage being less than an initial constant-voltage charging voltage
Data Source
AI summary
A battery charging method includes: determining whether a present charging cycle satisfies a floating charging condition when a first condition is satisfied, the first condition being that in a case where battery capacity is greater than a set capacity, a duration of continuous charging is greater than a set threshold; and charging using a set floating charging mode after determining that the present charging cycle satisfies the floating charging condition. As such, the battery capacity during the charging process is detected in real time. In a case where the battery capacity is greater than the set capacity, the duration of continuous charging is greater than the set threshold and the present charging cycle satisfies the floating charging condition, the floating charging mode is used in time, such that batteries are prevented from dangerous situations such as bulging, expansion and explosion, and the safety of battery charging is improved.