Adaptive Battery Charge Map Control for Degradation-Aware Fast Charging
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Solution Overview
Problem
Conventional multi-stage constant-current charging protocols do not account for battery degradation, leading to accelerated degradation when high C-rates are used, and updating C-rates based on battery voltage and current during charging is not considered.
Innovation Solution
A battery management system that updates a multi-stage constant-current charge map by monitoring battery voltage and current during charging, adjusting C-rates based on average current and weight factors, and updating reference currents for remaining SOC ranges based on the results of partially completed charging procedures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If high C-rate charging is used to reduce charging time, then charging speed is improved, but battery degradation is accelerated
Solution Approach 1:
The patent applies dynamics by making the charge map adaptive and changeable over time. The charge map is updated based on monitored battery voltage and current data, allowing the charging parameters to dynamically adjust according to the battery's actual state and degradation level, rather than using fixed static parameters throughout the battery's lifecycle
Solution Approach 2:
The patent changes the parameters of the charge map (voltage and current values) based on monitored battery performance. By updating these parameters according to actual charging data and degradation patterns, the system optimizes the balance between charging speed and battery protection, resolving the contradiction between high C-rate benefits and degradation risks
2Device complexity
If conventional multi-stage constant-current charging is used without updates, then charging procedure is simple, but it does not account for battery degradation
Solution Approach 1:
The patent implements feedback by continuously monitoring battery voltage and current during charging operations. This monitored data is fed back to update the charge map, creating a closed-loop system that adapts to battery degradation while maintaining a relatively simple charging procedure structure
Solution Approach 2:
The system performs self-service by automatically updating its own charge map parameters based on monitored charging data. The battery management system uses its own operational data to improve its charging strategy without requiring external intervention or complex manual adjustments
3Loss of time
If charging procedure ends after performing on only some SOC ranges, then charging time is reduced, but C-rate update results are not fully obtained
Solution Approach 1:
The patent applies preliminary action by using data from partially completed charging procedures to update the charge map for future use. Instead of waiting for complete charging cycles to gather sufficient data, the system proactively updates parameters based on available data, reducing future charging times while maintaining accuracy
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 a correlation between first to nth reference state of charge (SOC) ranges, first to nth reference currents and first to nth reference voltages for multi-stage constant-current charging, and a control unit to change to constant voltage charging using a kth reference voltage corresponding to a kth reference SOC range in response to the battery voltage having reached the kth reference voltage during constant current charging using a kth reference current corresponding to the kth reference SOC range to which an SOC of the battery belongs. The control unit updates the kth reference current of the charge map based on a time-series of the battery current in a charging period of the constant voltage charging.