Adaptive Battery Charging Using Current Relaxation Time
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing battery charging methods fail to adapt to changes within the battery during the charging process, leading to rapid temperature increases, low cycle performance, and short battery life, as well as the inability to detect and prevent internal short-circuits.
Innovation Solution
A charging method and apparatus that adjust the charging current and voltage based on the current relaxation time, determining this time by analyzing changes in the electrochemical reaction rate, and using a formula to calculate a would-be charging current, which allows for adaptive charging and improved safety and reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If constant current charging is performed continuously, then charging speed is improved, but battery temperature increases rapidly and battery life decreases
Solution Approach 1:
The charging method dynamically adjusts charging parameters (current and voltage) based on real-time battery state monitoring. The charging apparatus continuously monitors battery voltage, current, and temperature, and adjusts charging parameters accordingly to prevent rapid temperature increase while maintaining efficient charging.
Solution Approach 2:
The charging apparatus implements feedback control by monitoring battery parameters during charging and adjusting charging current and voltage based on the monitored states. When battery temperature or voltage reaches threshold values, the system automatically adjusts charging parameters to prevent overheating and extend battery life.
2Reliability
If constant voltage charging is performed, then battery safety is improved, but charging efficiency decreases
Solution Approach 1:
The charging process is divided into multiple stages with different charging modes. The apparatus segments the charging process into constant current charging phase, constant voltage charging phase, and intermediate adjustment phases, allowing optimal charging efficiency in early stages while ensuring safety in later stages.
Solution Approach 2:
The charging system dynamically switches between constant current and constant voltage modes based on battery state. This dynamic adjustment allows the system to maintain high charging efficiency when the battery can accept higher currents while ensuring safety when the battery approaches full charge or experiences elevated temperatures.
3Device complexity
If charging parameters are fixed, then device complexity is reduced, but adaptability to battery changes decreases
Solution Approach 1:
The charging apparatus performs self-adjustment by automatically monitoring battery parameters and modifying charging current and voltage without external intervention. The system uses built-in control algorithms to adapt charging parameters based on real-time battery state, eliminating the need for complex external control mechanisms.
Solution Approach 2:
The system implements closed-loop feedback control where battery parameters are continuously monitored and used to adjust charging parameters. This feedback mechanism enables the simple charging apparatus to adapt to battery changes automatically, maintaining high adaptability without increasing device complexity.
Data Source
AI summary
A charging method, where in a process of performing constant voltage charging on a battery at a charging voltage that is greater than an end-of-precharge voltage and less than a maximum charging voltage, a charging apparatus determines a current relaxation time and controls a charging current and a charging voltage based on the current relaxation time, to adaptively charge the battery.