Silicon-Anode Battery Cutoff Voltage Control for Swelling Reduction
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Solution Overview
Problem
Silicon anode batteries face significant volume expansion issues, known as swelling, which restricts the development of high-density silicon anode batteries.
Innovation Solution
An information processing method that adjusts the discharge cut-off voltage of a silicon-based anode battery pack based on parameters such as impedance, cycle count, time in high voltage or temperature states, and duration in low voltage states to slow down attenuation and reduce swelling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If silicon content in silicon anode batteries is increased to provide greater energy storage capacity, then the energy storage capacity is improved, but the volume expansion (swelling) of the silicon anode becomes more serious
Solution Approach 1:
The patent changes the discharge cut-off voltage parameter dynamically based on battery cycle count and impedance characteristics. By adjusting this electrical parameter, the patent controls the charging/discharging process to reduce mechanical stress on the silicon anode, thereby mitigating volume expansion while maintaining high capacity utilization
Solution Approach 2:
The patent implements a feedback mechanism that continuously monitors battery impedance and cycle count, then uses this information to adjust the discharge cut-off voltage. This closed-loop control ensures that the battery operates within optimal parameters to prevent excessive swelling while maximizing energy storage
2Quantity of substance
If discharge cut-off voltage is lowered to increase capacity utilization, then energy storage capacity is improved, but the attenuation rate increases and service life decreases
Solution Approach 1:
The patent transforms the static discharge cut-off voltage into a dynamic parameter that changes with battery cycle count and impedance. This dynamic adjustment allows the system to optimize between capacity utilization and service life at different stages of battery operation, preventing excessive attenuation while maintaining high capacity
Solution Approach 2:
The patent changes the discharge cut-off voltage parameter based on battery state (cycle count and impedance), optimizing the balance between capacity utilization and service life. By adjusting this parameter dynamically, the patent prevents the battery from operating in detrimental voltage ranges that would accelerate degradation
Data Source
AI summary
An information processing method, applied to an electronic device, the electronic device including a battery pack, an anode of the battery pack being a silicon-based anode, includes obtaining a first parameter of the battery pack in the electronic device in a current charge and discharge cycle, the first parameter being at least related to use characteristics of the silicon-based anode; and adjusting a discharge cut-off voltage of the battery pack based on the first parameter of the battery pack in the current charge and discharge cycle.