Battery Pack Cell Layout for Low-Temperature Discharge and Safety
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Solution Overview
Problem
Existing battery packs face a challenge in achieving concurrent high low-temperature discharge capacity and overall safety performance, as current solutions often result in a trade-off between the two.
Innovation Solution
A battery pack design that includes regions with varying thermal insulation capabilities, combining battery cells with specific volumetric energy densities, ionic conductivities, viscosities, and film-forming resistances to optimize the trade-off between low-temperature performance and safety.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If battery cells with high low-temperature discharge capacity are used, then low-temperature performance is improved, but safety performance deteriorates
Solution Approach 1:
The patent applies local quality by differentiating the battery pack into two distinct regions: a first region containing battery cells optimized for low-temperature discharge capacity and a second region containing battery cells optimized for safety performance. This spatial differentiation allows each region to fulfill its specific functional requirement without compromising the other, resolving the contradiction between low-temperature performance and safety performance at the system level.
2Object-affected harmful factors
If battery cells with high safety performance are used, then safety performance is improved, but low-temperature discharge capacity deteriorates
Solution Approach 1:
The patent implements local quality by assigning different functional characteristics to different spatial zones within the battery pack. The second region is specifically designed with battery cells that prioritize safety performance, while the first region focuses on low-temperature discharge capacity. This localized functional assignment ensures that safety-critical areas are protected without sacrificing overall low-temperature performance.
3Ease of manufacture
If uniform battery cell arrangement is used, then manufacturing simplicity is maintained, but performance optimization deteriorates
Solution Approach 1:
The patent applies segmentation by dividing the battery pack into two distinct regions with different functional characteristics. This segmentation allows for optimized performance in each region while maintaining a relatively simple overall structure. The first region contains battery cells for low-temperature discharge capacity and the second region contains battery cells for safety performance, enabling targeted optimization without requiring complete redesign of the entire system.
Data Source
AI summary
A battery pack includes at least a first battery cell and a second battery cell. The battery pack includes a region A and a region B. The region A is a region of a low thermal insulation capability and is located on all sides and/or at a bottom of the battery pack. A remaining region is the region B. A percentage of a number of the first battery cells among battery cells in the region A is 10% to 100%. A percentage of a number of the second battery cells among battery cells in the region B is 5% to 100%.