Lithium-Ion Charging Voltage Adjustment via Negative Electrode Potential
Solution Overview
Problem
Lithium-ion cells experience capacity diminishment over time due to uncontrolled charging processes, leading to potential overcharge or over-discharge conditions that can cause electrode degradation and reduce battery life.
Innovation Solution
A method that adjusts the constant voltage phase of the charging process for lithium-ion cells based on the potential value of the negative electrode, using a management circuitry that monitors and controls the voltage and current to prevent excessive cathode potential and electrolyte decomposition, thereby extending battery life and preventing degradation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a standard constant voltage charging process is used, then charging speed and efficiency are maintained, but electrode degradation occurs and battery life is reduced
Solution Approach 1:
The patent applies dynamics by transitioning from a static constant voltage charging process to a dynamic charging process that continuously adjusts the voltage threshold based on real-time negative electrode potential measurements. The charging voltage threshold is dynamically modified according to the measured potential, allowing the system to adapt charging parameters to the current state of the battery, thereby preventing electrode degradation while maintaining charging efficiency.
Solution Approach 2:
The patent implements feedback by measuring the negative electrode potential during charging and using this measurement to adjust the charging voltage threshold. The management integrated circuit continuously monitors the potential and provides feedback to modify the charging process, creating a closed-loop control system that prevents overcharging and electrode degradation while maintaining optimal charging speed.
2Loss of time
If charging voltage is increased to improve charging efficiency, then charging time is reduced, but excessive cathode potential is reached causing electrolyte decomposition
Solution Approach 1:
The patent uses feedback control by continuously measuring the negative electrode potential and adjusting the charging voltage threshold accordingly. This real-time feedback mechanism prevents the charging voltage from reaching levels that would cause excessive cathode potential and electrolyte decomposition, while still allowing for efficient charging by optimizing the voltage threshold based on actual battery conditions.
Solution Approach 2:
The patent applies parameter changes by modifying the charging voltage threshold parameter based on the measured negative electrode potential. Instead of using a fixed voltage threshold, the system dynamically changes the voltage parameter to match the battery's current state, preventing harmful effects while maintaining charging efficiency.
Data Source
AI summary
A method can include receiving a potential value of a negative electrode of a lithium-ion cell and, for a cell charging process for the lithium-ion cell, adjusting a constant voltage phase voltage based at least in part on the potential value of the negative electrode. Various other apparatuses, systems, methods, etc., are also disclosed.