Battery Cell Parallel Charging to Replace CV Equalization
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Solution Overview
Problem
The conventional CC-CV charging method for secondary batteries is inefficient in shortening the overall charging time due to prolonged CV charging, which leads to increased production time and capacity reduction, primarily because of concentration polarization and voltage variation among cells.
Innovation Solution
A method involving the parallel connection of battery cells after CC charging, using an activation tray assembly with terminal plates to connect the cells, significantly reducing the charging time by replacing the CV charging phase, with the parallel connection time set between 9 to 15 minutes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If CC-CV charging method is used, then charging completeness is improved, but charging time is extended
Solution Approach 1:
The patent extracts the essential function of CV charging (voltage equalization) and separates it from the time-consuming prolonged CV phase. By taking out only the necessary voltage equalization function and implementing it through parallel connection, the patent eliminates the extended charging time while preserving charging completeness.
Solution Approach 2:
Instead of following the conventional sequence of CC charging followed by CV charging, the patent inverts the approach by using parallel connection after CC charging to achieve voltage equalization. This inversion replaces the traditional CV charging method with a more efficient parallel connection method that achieves the same goal faster.
2Reliability
If CV charging is applied to ensure voltage equalization, then charging completeness is improved, but productivity is reduced
Solution Approach 1:
The patent extracts the voltage equalization function from the prolonged CV charging process and implements it through a brief parallel connection phase. This extraction allows the essential function to be achieved without the productivity-reducing time extension of traditional CV charging.
Solution Approach 2:
The patent changes the operational parameters by switching from sequential CC-CV charging to CC charging followed by parallel connection. This parameter change transforms the charging process from a time-intensive sequential operation to a more efficient process that achieves voltage equalization faster, thereby improving productivity.
3Reliability
If prolonged CV charging is used to charge remaining capacity, then charging completeness is improved, but charging time is extended
Solution Approach 1:
The patent inverts the conventional approach by using parallel connection instead of prolonged CV charging to fill the remaining capacity. This inversion achieves capacity filling through a faster mechanism that doesn't suffer from the time extension problems of traditional CV charging.
Solution Approach 2:
The patent skips the prolonged CV charging phase and rushes through the capacity filling process using parallel connection. By skipping the time-consuming CV phase and using parallel connection instead, the patent achieves capacity filling much faster while maintaining charging completeness.
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 effectively shortens the overall secondary battery charging time while maintaining the charging effect of CV charging, reducing voltage deviation and enhancing productivity by eliminating the need for prolonged CV charging.
Implementation Method 1
connecting the plurality of battery cells in parallel after charging the battery cells with a constant current
Data Source
AI summary
A secondary battery charging method that shortens charging time includes a step for introducing a plurality of battery cells onto an activation tray and CC-charging the battery cells; and a step for connecting the plurality of battery cells in parallel. The charging method according to the present invention shortens the time typically required for CV-charging by connecting battery cells in parallel after CC-charging, thus having the effect of replacing CV-charging.


