Battery Pack Cell Zoning for Low-Temperature Energy Retention

The patent applies local quality by differentiating the arrangement of battery cells based on their low-temperature energy retention characteristics. Specifically, battery cells with higher low-temperature energy retention rates are placed in the second area (cooler regions with better heat dissipation), while those with lower rates are placed in the first area (warmer regions with poorer heat dissipation). This non-uniform arrangement optimizes overall low-temperature performance by matching cell characteristics to thermal environment zones, resolving the contradiction between simple uniform structure and high reliability in cold conditions.

The patent divides the battery pack case into two distinct areas (first area with poorer heat dissipation and second area with better heat dissipation) and assigns battery cells with specific low-temperature energy retention characteristics to each area. This local differentiation strategy improves low-temperature reliability by ensuring that cells in cooler zones have higher inherent low-temperature performance, compensating for the thermal environment. The manufacturing complexity increase is justified by the significant improvement in low-temperature energy retention rate.

The patent implements local quality by selecting battery cells with different low-temperature energy retention rates for different thermal zones within the battery pack. Cells in the second area (cooler, better heat dissipation) have higher low-temperature energy retention rates, while cells in the first area (warmer, poorer heat dissipation) have lower rates. This spatial differentiation of cell characteristics ensures that each zone contributes consistently to overall energy release under low-temperature conditions, improving energy release consistency without requiring complex control systems.