Battery Charging Method for Cycle-Aware Capacity Maintenance
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Solution Overview
Problem
Current methods for charging rechargeable batteries either accelerate aging by increasing charging speed, reducing fully charged capacity, or fail to balance charging time and warranty life, leading to unsatisfactory battery lifespan and capacity degradation.
Innovation Solution
A charging method that uses a battery management module to record and adjust charging currents based on a characteristic curve of charge cycles versus residual capacity under warranty life limitations, dynamically adjusting the charging current to maintain the battery's residual capacity within warranty specifications by calculating target voltage differences and internal resistance variations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If charging current is increased to shorten charging time, then charging speed is improved, but battery aging accelerates and fully charged capacity decreases
Solution Approach 1:
The patent applies dynamics by making the charging current adjustable and variable rather than fixed. The battery management module dynamically adjusts charging current based on real-time battery status (temperature, charge cycle count, internal resistance) to optimize between charging speed and battery lifespan, resolving the contradiction between productivity and reliability
Solution Approach 2:
The patent changes physical parameters (charging current, temperature thresholds, voltage thresholds) based on battery aging state and environmental conditions. By adjusting these parameters dynamically according to battery health status and charge cycle count, the system achieves both fast charging and battery protection, resolving the contradiction between charging speed and battery lifespan
2Productivity
If charging current is increased to shorten charging time, then charging speed is improved, but fully charged capacity decreases
Solution Approach 1:
The patent implements feedback control by continuously monitoring battery temperature, charge cycle count, and charging status, then adjusting charging current accordingly. The battery management module uses feedback from battery health indicators to modulate charging parameters, ensuring both fast charging and maintenance of fully charged capacity within warranty specifications
3Ease of operation
If look-up table method is used to calculate charging current based on battery temperature, then charging process is simplified, but accuracy decreases when battery is aging
Solution Approach 1:
The patent applies preliminary action by pre-establishing a look-up table with charging parameters for different battery temperatures and charge cycle counts. This pre-computed data structure enables quick reference and simple control while maintaining accuracy across different battery aging states, resolving the contradiction between ease of operation and measurement precision
4Device complexity
If conventional charging methods are used, then charging process is simple, but balance between charging time and warranty life cannot be attained
Solution Approach 1:
The patent implements self-service by enabling the battery management module to autonomously monitor battery status, determine optimal charging parameters, and adjust charging current without external intervention. This self-managing capability achieves both fast charging and warranty life protection while maintaining relatively simple system architecture, resolving the contradiction between device complexity and reliability
Data Source
AI summary
A charging method for a rechargeable battery and a related charging architecture are provided. The provided charging method includes following steps. A characteristic curve of the rechargeable battery related to charge cycle vs. a residual capacity of a non-constant voltage charging stage under a warranty life limitation is provided. An expected residual capacity corresponding to a condition when a terminal voltage of the rechargeable battery reaches a limited charge voltage is found from the characteristic curve related to the charge cycle vs. the residual capacity of the non-constant voltage charging stage by using a current charge cycle count of the rechargeable battery. A real residual capacity corresponding to a condition when the terminal voltage of the rechargeable battery reaches the limited charge voltage approaches to the expected residual capacity by adjusting a charging current of the rechargeable battery.