Battery Charging Current Cycling to Reduce Polarization
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Solution Overview
Problem
Conventional battery charging methods using constant current and constant voltage stages can lead to prolonged charging times due to polarization phenomena, resulting in increased battery impedance and reduced service life.
Innovation Solution
A charging method and device that alternate between two current values in each charging cycle, with the second current value being less than the first, and switch to a target cutoff voltage at the end of the cycle, reducing polarization and impedance accumulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If constant current charging is used, then charging speed is improved, but polarization phenomena increase leading to prolonged charging time
Solution Approach 1:
The charging device implements periodic switching between first and second current values during constant current charging. This periodic action prevents polarization phenomena from accumulating by intermittently reducing the charging current, thereby avoiding prolonged charging time while maintaining overall charging speed efficiency.
Solution Approach 2:
The charging current is made dynamic by switching between two different current values (first and second current values) rather than maintaining a constant current. This dynamic adjustment optimizes the charging process by adapting the current level to prevent polarization, resolving the contradiction between charging speed and charging time.
2Speed
If constant current charging is used, then charging speed is improved, but battery impedance increases reducing service life
Solution Approach 1:
By periodically switching between first and second current values, the charging device prevents continuous high current stress on the battery. This periodic reduction in current minimizes impedance accumulation and polarization effects, thereby extending battery service life while maintaining acceptable charging speed through the alternating current pattern.
3Productivity
If dual current value switching is implemented, then polarization is reduced and charging efficiency is improved, but device complexity increases
Solution Approach 1:
The charging device uses periodic switching between two current values with a simple control logic that tracks charging cycles. This approach achieves improved charging efficiency by reducing polarization while maintaining relatively simple device complexity through the use of a straightforward cycle-based control mechanism rather than complex adaptive algorithms.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach shortens the charging duration and prolongs the battery's service life by improving charging speed and reducing impedance, thereby enhancing overall charging efficiency.
Implementation Method 1
Conventional battery charging methods using constant current and constant voltage stages can lead to prolonged charging times due to polarization phenomena, resulting in increased battery impedance and reduced service life
Data Source
AI summary
A charging method includes: charging a battery according to a second current value after charging the battery according to a first current value in each of N charging cycles, the second current value being less than the first current value, and N being a positive integer; and charging the battery according to a target cutoff voltage value in the case where a target voltage value is greater than or equal to the target cutoff voltage value at the end of the N charging cycle. The target voltage value is a charging voltage value corresponding to the first current value, and the target cutoff voltage value is a first cutoff voltage value, or the target voltage value is a charging voltage value corresponding to the second current value, the target cutoff voltage value is a second cutoff voltage value.