Pack Battery Charging Termination Current for Aging-Aware Capacity Control
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Solution Overview
Problem
Existing pack battery charging methods fail to optimize charging capacity and prolong cycle life when charging batteries with varying degrees of deterioration, especially when using chargers with different output voltages.
Innovation Solution
A pack battery charging method that detects the degree of deterioration and supply voltage, and specifies a charging termination current to charge the battery optimally, thereby extending user time and minimizing battery deterioration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the charging termination current is decreased to increase the charging amount, then the charging capacity is improved, but the battery deterioration is accelerated and life is shortened
Solution Approach 1:
The charging termination current is dynamically adjusted based on the battery's state of charge and age. The system transitions from a fixed termination current to a variable one that adapts to the battery's actual condition, allowing optimal charging capacity while preventing excessive deterioration through real-time parameter modification
Solution Approach 2:
The invention changes the charging termination current parameter based on the battery's state of charge and age. By modifying this critical parameter dynamically rather than using a fixed value, the system achieves both high charging capacity and battery life extension by matching the termination current to the battery's actual condition
2Reliability
If the charging termination current is increased for deteriorated batteries, then the battery deterioration is suppressed, but the charging capacity is reduced
Solution Approach 1:
The system dynamically adjusts the charging termination current parameter based on the battery's state of charge and age. For deteriorated batteries, the termination current is increased to suppress further deterioration, while for healthier batteries, a lower termination current maintains high charging capacity. This parameter adaptation resolves the contradiction between battery life and charging capacity
Solution Approach 2:
The charging termination current transitions from a static value to a dynamic parameter that responds to the battery's actual condition. The system continuously monitors battery state and adjusts the termination current accordingly, enabling optimal balance between charging capacity and battery life preservation under varying conditions
3Speed
If a high output voltage charger is used for deteriorated batteries, then the charging speed is improved, but the charging capacity increases excessively and accelerates deterioration
Solution Approach 1:
The system implements feedback control by continuously monitoring the battery's state of charge and age during charging. Based on this feedback, the charging termination current is dynamically adjusted to prevent excessive charging capacity accumulation in deteriorated batteries, thereby protecting battery life while still utilizing the high-speed charging capability of high output voltage chargers
Solution Approach 2:
The charging termination current is made dynamic and adaptive to the battery's actual condition during charging. Even when using high output voltage chargers that provide high charging speed, the system adjusts the termination current based on real-time battery state monitoring, preventing excessive charging capacity that would accelerate deterioration while maintaining fast charging benefits
Data Source
AI summary
A pack battery charging method is a charging method for connecting pack battery to charger and charging pack battery at a constant voltage and a constant current. Pack battery detects a degree of deterioration of battery and a supply voltage at which charger charges pack battery, and specifies a charging termination current from both the supply voltage of charger and the degree of deterioration of battery to perform charging.