Battery Charging Profile With Impedance-Based Current Switching
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Solution Overview
Problem
Current battery charging methods result in increased total charge time due to rising battery impedance with usage, leading to longer constant-current charge times and shorter constant-voltage charge times, and do not effectively prevent overcharge.
Innovation Solution
A method involving alternating charging currents and voltages, where the battery is charged with a first current to a first state of charge, then with a second current to a second state, and finally with constant voltage to full charge, with adjustments based on impedance and state of charge to optimize charge time and prevent overcharge.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If constant current charging is used with preset current and voltage, then charging simplicity is maintained, but total charge time increases due to rising battery impedance
Solution Approach 1:
The charging current is dynamically adjusted based on battery impedance changes. The method divides charging into multiple stages with different currents: a first charging current for initial charging, and a second charging current (higher than the first) when impedance increases, allowing the system to adapt to battery state changes and reduce total charging time while maintaining safety
Solution Approach 2:
The method changes the charging current parameter based on battery impedance and state of charge. By monitoring battery voltage and calculating impedance, the system switches between different current levels, optimizing the charging process to reduce time loss without excessive complexity
2Productivity
If charging current is increased to shorten charge time, then productivity improves, but risk of overcharge and battery damage increases
Solution Approach 1:
The method implements feedback control by continuously monitoring battery voltage and calculating battery impedance during charging. Based on this feedback, the system adjusts the charging current in real-time, switching from a first current to a second current based on impedance thresholds, thereby maintaining high charging speed while preventing overcharge and ensuring battery safety
Solution Approach 2:
The method takes preliminary protective actions by setting predetermined impedance thresholds and corresponding current limits before overcharge can occur. When impedance reaches critical levels, the system proactively reduces current or switches charging modes, preventing potential battery damage before it happens
Data Source
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AI summary
A charging method includes the following steps: in the mth charge and discharge cycle, constant-current charging a battery with a first charging current to a first state of charge, where the battery has a corresponding first cut-off voltage, constant-current charging the battery with a second charging current In to a second state of charge, where the battery has a second cut-off voltage at the end of constant-current charging, and constant-voltage charging the battery with the second cut-off voltage to a fully charged state. The charging method, an electronic apparatus, and a storage medium that are provided in this application can shorten full charge time of a battery and avoid overcharge of the battery.