High-Voltage Lithium-Polymer Battery Swelling Management
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Solution Overview
Problem
High-voltage lithium-polymer batteries in portable electronic devices experience degradation and swelling due to repeated charge-discharge cycles, high charge voltages, and temperature increases, leading to reduced capacity and potential physical damage to devices, with conventional monitoring mechanisms failing to manage these issues effectively.
Innovation Solution
A system that monitors the cycle number, temperature, and state-of-charge of the battery, modifying the charging technique by reducing the charge voltage and disconnecting the battery from the charger when thresholds are exceeded to mitigate swelling and degradation, including reducing the charge voltage by 10 mV to 50 mV for each cycle number threshold and disconnecting if the battery remains fully charged for an extended period.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If high charge voltage is used to increase battery capacity and power output, then battery performance is improved, but battery swelling and degradation accelerate
Solution Approach 1:
The charging system dynamically adjusts the charge voltage based on real-time monitoring of cycle number and temperature. For new batteries, higher voltages (4.25V-5.0V) are used to maximize power output. As cycle count increases or temperature rises, the system automatically reduces charge voltage to mitigate swelling and degradation, thus adapting the charging strategy to the battery's current state.
Solution Approach 2:
The system changes the charge voltage parameter based on battery age and thermal conditions. The charge voltage is reduced by 10mV to 50mV for each cycle number threshold exceeded, and further reduced if temperature exceeds thresholds. This parameter adjustment resolves the contradiction by allowing high power output when appropriate while preventing damage under stress conditions.
2Duration of action of moving object
If continuous charging at high voltage is applied to maximize battery usage, then energy availability is improved, but battery life and capacity are reduced
Solution Approach 1:
The system implements periodic monitoring of cycle number and temperature, with charging parameters adjusted at defined intervals. The charge voltage is modified based on accumulated cycle counts and thermal history, creating a periodic adaptation pattern that balances continuous usage needs with long-term battery health preservation.
Solution Approach 2:
The charging system incorporates feedback mechanisms that continuously monitor battery cycle number, temperature, and charging status. Based on this feedback, the system automatically adjusts charge voltage to extend battery life while maintaining adequate energy availability. The feedback loop ensures that charging behavior adapts to the battery's aging process.
3Loss of information
If conventional battery monitoring mechanisms are used, then basic charge status is tracked, but swelling and degradation are not detected or managed
Solution Approach 1:
The system performs preliminary monitoring of cycle number and temperature before significant swelling or degradation occurs. By tracking these parameters continuously from the beginning of battery life, the system can take preventive actions (voltage reduction) before harmful effects manifest, rather than reacting after damage has occurred.
Solution Approach 2:
The system introduces cycle number and temperature as intermediary parameters that mediate between charging operations and battery health outcomes. These intermediaries provide early warning signals of potential swelling and degradation, enabling the system to adjust charging parameters before direct damage occurs to the battery structure.
Data Source
AI summary
The disclosed embodiments provide a system that manages use of a battery corresponding to a high-voltage lithium-polymer battery in a portable electronic device. During operation, the system monitors a cycle number of the battery during use of the battery with the portable electronic device, wherein the cycle number corresponds to a number of charge-discharge cycles of the battery. If the cycle number exceeds one or more cycle number thresholds, the system modifies a charging technique for the battery to manage swelling in the battery and use of the battery with the portable electronic device.