Battery Cell Activation Tray for Faster Charging Without CV
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Solution Overview
Problem
The conventional CC-CV charging method for secondary batteries faces challenges in shortening the overall charging time, particularly due to the prolonged time required for CV charging, which leads to increased productivity costs and potential capacity reduction.
Innovation Solution
The method involves charging secondary battery cells with a constant current (CC) followed by a parallel connection of the cells, which mimics the effect of CV charging, thereby reducing the overall charging time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If CC-CV charging method is used, then battery cell voltage reaches buffer voltage with acceptable time, but overall charging time is extended due to prolonged CV charging
Solution Approach 1:
The patent extracts and removes the CV charging step from the conventional CC-CV charging process. By eliminating the CV charging phase entirely and replacing it with a parallel connection step after CC charging, the method shortens overall charging time while maintaining battery activation effectiveness.
Solution Approach 2:
The patent skips the traditional CV charging phase by directly transitioning from CC charging to parallel connection. This skipping of the prolonged CV charging step rushes through the charging process more efficiently, reducing total time while achieving the necessary battery activation.
2Reliability
If CV charging is applied to fill remaining capacity, then battery cell is fully charged, but charging current drops to preset limit before active material is completely consumed
Solution Approach 1:
The patent removes the CV charging step that causes prolonged charging time. Instead, it uses parallel connection to achieve the same capacity filling effect more efficiently, avoiding the time extension inherent in conventional CV charging.
Solution Approach 2:
The patent introduces parallel connection as an intermediary step between CC charging and complete battery activation. This parallel connection phase serves as a mediator that achieves capacity filling without the limitations of CV charging, where current drops before active material is fully consumed.
3Loss of time
If parallel connection between cells is applied after CC charging, then CV charging time is reduced, but additional equipment (activation tray) is required
Solution Approach 1:
The activation tray serves multiple functions: it holds multiple battery cells during charging, provides electrical connection for parallel connection between cells, and facilitates the entire charging process. This multi-functionality reduces the need for separate equipment while achieving time reduction.
Solution Approach 2:
The patent merges the cell holding function and the parallel connection function into a single activation tray structure. By combining these functions, the equipment complexity is minimized while still achieving the time-saving parallel connection benefit.
Data Source
AI summary
A secondary battery charging method 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 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.