Segmented Battery Cell Layout for Safety and Energy Density
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Solution Overview
Problem
Existing battery cell designs face a trade-off between safety and performance, as uniform designs improve safety but reduce energy density, rate performance, and cycling performance, and fail to balance these factors effectively.
Innovation Solution
A battery cell configuration with an intermediate portion and side portions, where the intermediate portion has enhanced dry battery cell nail penetration short-circuit resistance and the side portions focus on maintaining energy density and rate performance, using a combination of silicon-based materials and optimized electrode structures to balance safety and performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If uniform design is applied to the entire battery cell interior, then safety is improved, but energy density, rate performance and cycling performance are reduced
Solution Approach 1:
The patent applies different structural configurations to different regions of the battery cell. The intermediate portion has a first structural configuration optimized for safety (higher short-circuit resistance), while the side portions have a second structural configuration optimized for performance (higher energy density and rate performance). This local differentiation allows each region to contribute its strengths to the overall cell performance.
Solution Approach 2:
The battery cell interior is divided into distinct segments: an intermediate portion and side portions. Each segment is independently designed with specific structural characteristics - the intermediate portion with enhanced safety features and the side portions with enhanced performance features. This segmentation enables simultaneous optimization of safety and performance in different locations.
2Reliability
If uniform design is applied to the entire battery cell interior, then safety is improved, but rate performance is reduced
Solution Approach 1:
The side portions are designed with structural characteristics that optimize rate performance while the intermediate portion maintains safety focus. This local specialization allows the battery cell to achieve high rate performance in the side portions without compromising the safety provided by the intermediate portion.
Solution Approach 2:
By segmenting the battery cell into intermediate and side portions with different structural optimizations, the patent enables the side portions to contribute high rate performance while the intermediate portion provides safety assurance, resolving the contradiction between safety and rate performance.
3Reliability
If uniform design is applied to the entire battery cell interior, then safety is improved, but cycling performance is reduced
Solution Approach 1:
The patent implements local quality differentiation where side portions are optimized for cycling performance through specific structural characteristics, while the intermediate portion maintains safety optimization. This allows the battery cell to achieve superior cycling performance without sacrificing the safety provided by the intermediate portion.
Solution Approach 2:
The segmentation of the battery cell into intermediate and side portions enables independent optimization of cycling performance in the side portions while maintaining safety in the intermediate portion, resolving the contradiction between safety and cycling performance.
4Reliability
If intermediate portion has enhanced short-circuit resistance, then safety is improved, but overall cell performance must be maintained
Solution Approach 1:
The patent applies local quality by designing the intermediate portion with enhanced short-circuit resistance for safety while the side portions are designed with structural characteristics that maintain high energy density and rate performance. This local differentiation ensures that safety enhancements in the intermediate portion do not compromise overall cell performance.
Solution Approach 2:
By segmenting the battery cell into intermediate and side portions with different functional optimizations, the patent allows the intermediate portion to provide safety enhancement while the side portions compensate for any performance loss, thereby maintaining overall cell performance while improving safety.
Data Source
AI summary
A battery cell, a battery module, a battery pack, and an electrical apparatus are provided. The battery cell includes an intermediate portion and side portions located on two sides of the intermediate portion in a thickness direction, the intermediate portion comprising m battery cell sub-units and the side portions comprising n battery cell sub-units, where m+n is an integer greater than or equal to 3. Each of the battery cell sub-units comprises a positive electrode sheet, a negative electrode sheet and a separator arranged between the positive electrode sheet and the negative electrode sheet, and each of the m battery cell sub-units has a dry battery cell nail penetration short-circuit resistance greater than that of each of the n battery cell sub-units.