Adaptable Battery Charging via Impedance-Based Cutoff Adjustment
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Solution Overview
Problem
Battery charging technologies fail to adapt to changes in battery impedance due to charging cycles, leading to premature cutoffs and reduced capacity in high-cycle count batteries.
Innovation Solution
Adapting charging profiles by modifying cutoff voltage and current thresholds based on battery impedance and open circuit voltage (OCV) measurements, allowing for dynamic adjustment of charging parameters to optimize capacity and speed for high-cycle count batteries.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If fixed cutoff voltage and current thresholds are used for battery charging, then charging control is simple, but battery capacity is reduced and charge time increases for high-cycle count batteries due to premature cutoffs caused by increased impedance
Solution Approach 1:
The patent implements dynamic charging profiles that adapt cutoff voltage and current thresholds based on the battery's cycle count and impedance characteristics. Instead of using fixed thresholds, the system modifies charging parameters in real-time according to battery condition, allowing high-cycle count batteries to receive higher cutoff values that compensate for increased impedance, thereby reducing charge time while maintaining safety
Solution Approach 2:
The system changes charging parameters (cutoff voltage and current thresholds) based on battery cycle count and impedance measurements. By adjusting these parameters dynamically - increasing cutoff values for high-cycle batteries and decreasing them for low-cycle batteries - the system optimizes charging efficiency for different battery states without requiring complex hardware modifications
2Device complexity
If fixed cutoff voltage and current thresholds are used for battery charging, then charging control is simple, but battery capacity is reduced due to premature cutoffs in high-cycle count batteries
Solution Approach 1:
The patent implements dynamic charging profiles that adapt cutoff voltage and current thresholds based on the battery's cycle count and impedance characteristics. Instead of using fixed thresholds, the system modifies charging parameters in real-time according to battery condition, allowing high-cycle count batteries to receive higher cutoff values that compensate for increased impedance, thereby reducing charge time while maintaining safety
Solution Approach 2:
The system changes charging parameters (cutoff voltage and current thresholds) based on battery cycle count and impedance measurements. By adjusting these parameters dynamically - increasing cutoff values for high-cycle batteries and decreasing them for low-cycle batteries - the system optimizes charging efficiency for different battery states without requiring complex hardware modifications
Data Source
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AI summary
Because a rechargeable battery has an increased number of uses (e.g., cycles), the battery's internal impedance can increase and the efficiency of the battery can become degraded. This internal resistance can cause cutoff voltage thresholds and cutoff current thresholds to prematurely stop a phase of battery charging, as these cutoff values can be based on low-cycle count batteries. New cutoff values can, instead, be based on battery impedance. Use of an adjusted cutoff current threshold during a constant voltage cycle can increase the capacity of high-cycle count batteries. Use of an adjusted cutoff voltage threshold in step charging can increase the charging speed of high-cycle count batteries. These increases in efficiency by using adjusted cutoff values can increase as the battery is further high-cycle count, in comparison with low-cycle count cutoff values used with high-cycle count batteries.