High-Capacity Battery Cell Grouping for Consistent Parallel Packs

The patent applies preliminary action by performing formation and capacity grading of battery cells before they are connected in shunt to form high-capacity batteries. This pre-grading process ensures that only cells with consistent performance parameters (capacity, internal resistance, voltage, self-discharge rate) are grouped together, thereby maintaining high consistency in the final high-capacity battery while achieving the desired high capacity through parallel connection.

The patent implements preliminary action by conducting formation and comprehensive quality grading of battery cells before assembling them into high-capacity battery packs. This pre-screening process identifies and separates cells with quality defects or performance deviations, ensuring that only cells meeting strict consistency criteria are connected in shunt. This preliminary grading action guarantees both high capacity and stable performance throughout the battery's operational life.

The patent applies the merging principle by combining the electrolyte filling operations for multiple battery cells into a single unified process. Instead of separately filling electrolyte into each individual cell, the patent designs a common electrolyte cavity that accommodates multiple battery cells, allowing one electrolyte filling operation to serve all cells simultaneously. This merging approach maintains manufacturing simplicity while ensuring consistent electrolyte distribution and improving overall battery performance.