Multi-stage Constant Current Charging Reducing Battery Degradation
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Solution Overview
Problem
Conventional battery charging methods involving constant-current and constant-voltage stages result in a low charging speed due to the lengthy constant-voltage charging stage, which also shortens the battery's service life.
Innovation Solution
A multi-stage constant-current charging method where each stage has a progressively lower charging current, followed by a constant-voltage charging stage that ends when the current reaches a predetermined higher value, allowing for a shorter constant-voltage period and increased charging speed without reducing battery power.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional constant-current and constant-voltage charging method is used, then battery charging is completed, but charging speed is low due to lengthy constant-voltage stage
Solution Approach 1:
The charging process is divided into multiple constant-current charging stages with different current values, followed by a constant-voltage charging stage. This segmentation allows the battery to be charged more efficiently by using higher currents in earlier stages when the battery can accept them, rather than using a single lower current throughout.
Solution Approach 2:
The charging current is dynamically adjusted through multiple stages, starting with higher currents and progressively reducing to lower currents before transitioning to constant-voltage charging. This dynamic adjustment optimizes charging speed at different states of charge, improving overall charging efficiency while protecting the battery.
2Reliability
If conventional constant-voltage charging stage is extended, then battery is fully charged, but battery service life is shortened due to prolonged high-voltage state
Solution Approach 1:
The battery is pre-charged through multiple constant-current stages that progressively fill the battery capacity before the constant-voltage stage begins. This preliminary action reduces the duration needed for the harmful constant-voltage high-field state, thereby protecting the battery while ensuring complete charging.
Solution Approach 2:
The charging parameters (current and voltage) are changed through multiple discrete stages. By using different current values in sequential stages and setting appropriate voltage thresholds, the patent optimizes the charging profile to minimize time spent at high voltages that degrade battery life, while still achieving complete charging.
Data Source
AI summary
Provided are a multi-stage constant current charging method and a charging apparatus. The multi-stage constant current charging method includes the following. Perform a multi-stage constant-current charging on a battery, where a constant-current charging cut-off voltage is larger than a second voltage. Perform a constant-voltage charging on the battery, where a constant-voltage charging cut-off current is larger than a second current.