Adaptive Battery Charge Map Updates 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 monitored 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 even if charging is incomplete.
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 system dynamically updates the charge map based on monitored battery voltage and current during charging, allowing the C-rates to be adjusted according to the battery's actual state and degradation level, rather than using fixed predetermined values
Solution Approach 2:
The patent implements feedback by continuously monitoring battery voltage and current during charging and using this information to update the charge map. The system measures actual charging behavior, compares it with expected behavior, and adjusts future C-rates based on this feedback to prevent excessive degradation while maintaining charging efficiency
2Ease of operation
If conventional multi-stage constant-current charge map is used without updating, then charging procedure is simple, but it does not account for battery degradation
Solution Approach 1:
The patent applies self-service by enabling the charge map to update itself automatically during charging operations. The system uses its own monitoring capabilities to collect battery data and autonomously adjusts the C-rates in the charge map without requiring external intervention or complex manual recalibration
Solution Approach 2:
The patent applies preliminary action by updating the charge map in advance based on charging history and degradation patterns. The system prepares adjusted C-rates before they are needed, so that when charging occurs, the optimized values are already in place to prevent degradation
3Loss of time
If charging is interrupted or incomplete, then charging time is reduced, but remaining SOC ranges cannot be updated
Solution Approach 1:
The patent applies universality by making the charge map update mechanism applicable to partial charging scenarios. The system can update C-rates for completed SOC ranges and extrapolate or infer updates for remaining ranges, making the update process valid whether charging is complete or interrupted
Solution Approach 2:
The patent applies partial action by accepting and processing only the portion of charging data that is available when charging is interrupted. The system updates the charge map based on the SOC ranges that were actually charged, rather than requiring complete charging cycles
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.