Dynamic Battery Charging Control for Rapid Capacity Determination
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Solution Overview
Problem
As battery technology advances and capacity increases, the charging time of batteries becomes longer, necessitating improved charging speed to enhance work efficiency and user experience for power tools.
Innovation Solution
A method and charger system that initially charges batteries with constant power until a predetermined voltage is reached, then switches to a first charging current, adjusting the voltage threshold based on real-time voltage variations to ensure full and rapid charging, with the first charging current time varying according to battery capacity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If battery capacity is increased, then energy storage is improved, but charging time becomes longer
Solution Approach 1:
The patent implements dynamic charging current adjustment based on real-time battery state detection. The charging current is not fixed but varies dynamically through multiple stages: initial constant power charging, followed by constant current charging, and finally constant voltage charging. This dynamic approach allows the system to optimize charging speed at each stage, reducing overall charging time for high-capacity batteries.
Solution Approach 2:
The patent changes multiple charging parameters during the charging process including charging current, charging voltage, and charging power. By adjusting these parameters based on battery state (voltage, current, temperature), the system achieves faster charging for high-capacity batteries while maintaining safety. The voltage threshold is also dynamically adjusted based on battery capacity, allowing higher voltage thresholds for larger batteries to enable faster charging.
2Device complexity
If constant voltage charging is used, then charging control is simple, but charging speed is limited and charging time is long
Solution Approach 1:
The patent divides the charging process into multiple distinct stages: constant power charging stage, constant current charging stage, and constant voltage charging stage. Each stage has its own control strategy and parameter settings. This segmentation allows the system to use optimal charging methods for different battery states, significantly reducing charging time compared to single-stage constant voltage charging, while keeping each individual stage relatively simple to control.
Solution Approach 2:
The system transitions from static constant voltage charging to dynamic multi-stage charging with automatic stage switching. The charging mode dynamically changes based on real-time detection of battery voltage, current, and temperature, enabling faster charging speeds during appropriate stages while maintaining simple overall control through automated stage transitions.
3Loss of time
If voltage threshold is increased to speed up charging, then charging time is reduced, but battery safety may be compromised
Solution Approach 1:
The patent implements real-time feedback control by continuously detecting battery voltage, current, and temperature during charging. Based on this feedback, the system dynamically adjusts charging parameters including the voltage threshold. For batteries with larger capacity or higher temperature, the system automatically lowers the voltage threshold to prevent overcharging and thermal runaway, thus maintaining safety while still enabling faster charging within safe limits.
Solution Approach 2:
The system dynamically changes the voltage threshold parameter based on battery capacity and temperature conditions. Larger capacity batteries receive higher voltage thresholds enabling faster charging, while smaller or hotter batteries receive lower thresholds for safety. This adaptive parameter adjustment resolves the contradiction by making the voltage threshold flexible rather than fixed.
Data Source
AI summary
A method for charging a battery includes charging the battery with a constant charging power until a battery voltage reaches a predetermined voltage. After the battery voltage reaches the predetermined voltage, charging the battery with a first charging current at least once to a voltage threshold that exceeds the predetermined voltage. A charging time in the charging process with the first charging current for the first time is a predetermined value. Subsequent charges provided in the charging process with the first charging current is a changing value according to a battery capacity. The voltage threshold exceeding the predetermined voltage is changed according to voltage variations in the charging process with the first charging current.