Adaptive Battery Charge Map for Degradation-Aware CC Charging
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Solution Overview
Problem
Existing battery charging protocols, such as multi-stage constant-current charging, do not account for the changing operational state of batteries over time, leading to accelerated degradation and inefficient charging.
Innovation Solution
A battery management system that updates a multi-stage constant-current charge map based on real-time voltage and current monitoring, adjusting C-rates according to the battery's operational state, and updating the charge map even if the charging procedure is not completed across all voltage ranges.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multi-stage constant-current charging is performed using fixed C-rates according to voltage ranges, then charging efficiency is improved, but battery degradation accelerates over time
Solution Approach 1:
The charge map is dynamically updated based on actual battery voltage curves measured during charging operations. The controller compares measured voltage curves with reference voltage curves and adjusts C-rates for subsequent charging cycles, transforming the static charging protocol into an adaptive system that responds to battery degradation
Solution Approach 2:
The system implements feedback by measuring actual battery voltage during charging, comparing it with reference voltage curves, and using this information to update the charge map. This closed-loop approach allows the system to learn from actual battery behavior and adjust charging parameters to prevent degradation
2Measurement precision
If the charge map is updated using only completed charging cycles, then data accuracy is improved, but charging time increases
Solution Approach 1:
The system updates the charge map using partial charging data. When a charging cycle is interrupted or not completed across all voltage ranges, the controller still processes and utilizes the voltage curve data from the portions that were charged, updating the charge map incrementally rather than waiting for complete cycles
Solution Approach 2:
The system prepares updated C-rates in advance for subsequent charging operations by processing available data immediately. When partial charging data becomes available, the controller calculates updated parameters and stores them for future use, so that the next charging cycle benefits from the updated information without delay
Data Source
AI summary
A battery management system includes a sensing unit to generate a sensing signal indicating a battery voltage and a battery current of a battery, a memory unit to store a charge map recording first to nth reference currents, first to nth reference voltage ranges, first to nth reference states of charge (SOCs) and first to nth reference voltage curves for multi-stage constant-current charging, and a control unit to command constant-current charging to a charging circuit using a kth reference current corresponding to a kth reference voltage range to which the battery voltage belongs, and update the charge map by comparing a kth measured voltage curve indicating a correlation between the battery voltage and the SOC of the battery over a charging period of the constant-current charging with a kth reference voltage curve in response to the battery voltage having reached an upper limit of the kth reference voltage range.