LFP Battery Charging Guidance for Unreliable SOC States
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Solution Overview
Problem
Certain types of batteries in electric vehicles, such as LFP batteries, experience rapid deterioration in charging performance if not periodically fully charged, necessitating a technology to maintain battery performance.
Innovation Solution
A battery charging guidance method and system that determines the type of battery installed in a vehicle, monitors its state, and when it enters an unreliable state of charge (SOC), sets the charging target to full charge and disables user adjustment, providing alarms and messages to ensure periodic full charging.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the user is allowed to freely set the charging target amount, then the ease of operation is improved, but the reliability of battery performance deteriorates for LFP batteries
Solution Approach 1:
The charging target setting function dynamically changes its state based on battery conditions. When the battery enters an unreliable SOC state, the function is automatically deactivated and cannot be modified by the user. When the battery exits this state, the function is reactivated. This dynamic adjustment resolves the contradiction by temporarily restricting user freedom to preserve battery reliability during critical periods.
Solution Approach 2:
The system continuously monitors battery charging patterns and SOC reliability status, providing feedback that triggers automatic activation or deactivation of the charging target setting function. This feedback mechanism ensures that user control is appropriately restricted only when battery performance reliability is at risk, while maintaining full operational freedom during normal conditions.
2Reliability
If the charging target amount setting function is deactivated to ensure periodic full charging, then the battery performance reliability is improved, but the ease of operation deteriorates
Solution Approach 1:
The charging target setting function is not permanently disabled but dynamically adjusted based on real-time battery status. It is deactivated only when the battery enters an unreliable SOC state and reactivated when the battery exits this state, providing temporary restrictions only when necessary for battery performance reliability.
Solution Approach 2:
The system automatically monitors battery conditions and self-adjusts the charging target setting function status without requiring user intervention. The system serves itself by detecting unreliable SOC states and automatically deactivating the setting function, then reactivating it when conditions improve, eliminating the need for manual user management.
3Reliability
If preliminary alarms are output to guide periodic full charging, then the battery performance reliability is improved, but the loss of information increases due to multiple alarm notifications
Solution Approach 1:
Preliminary alarms are output periodically based on charge/discharge cycle counts rather than continuously. The system outputs a first preliminary alarm after five consecutive cycles without full charging, and a second preliminary alarm after eight consecutive cycles, providing staged notifications that guide users toward periodic full charging without excessive information loss.
Data Source
AI summary
A battery charging guidance method can include determining a type of a battery installed in a vehicle, monitoring a charging state of the battery, and when the battery is determined to be a lithium iron phosphate (LFP) type and the charging state of the battery enters an unreliable state of charge (SOC), setting a charging target amount of the battery to full charge, and deactivating a charging target amount setting function of a user in a vehicle app included in a head unit of the vehicle and/or in a user terminal app included in a user terminal.