Secondary Battery Connection Layout for Lower Internal Resistance
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Solution Overview
Problem
Existing secondary batteries face issues with high internal resistance leading to local degradation and limited space for electronic components due to conventional connection designs.
Innovation Solution
The secondary battery and battery pack incorporate asymmetric connection members with varying lengths and orientations of inner and outer plates and tabs to reduce internal resistance and optimize space utilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional symmetric connection members are used, then manufacturing is simple, but internal resistance is high causing local degradation
Solution Approach 1:
The connection member is designed with asymmetric structure where the first connection member has a first inner plate and first outer plate with different lengths, and the second connection member has a second inner plate and second outer plate with different lengths. This asymmetric design optimizes current distribution and reduces internal resistance, preventing local degradation while maintaining manufacturing feasibility through standardized production processes for asymmetric components.
2Area of stationary object
If conventional connection designs are used, then structure is simple, but installation space for electronic parts is limited
Solution Approach 1:
The asymmetric connection member design with varying inner and outer plate lengths creates optimized spatial arrangement that frees up installation space for electronic parts while maintaining structural integrity and electrical connectivity.
Solution Approach 2:
The connection member extends in multiple directions with inner plates and outer plates arranged at different positions, utilizing three-dimensional space more efficiently to accommodate both connection functions and electronic component installation requirements.
3Reliability
If asymmetric connection members with varying plate lengths are used, then internal resistance is reduced, but manufacturing precision requirements increase
Solution Approach 1:
The asymmetric design with specific length ratios between inner and outer plates reduces internal resistance through optimized current distribution. The manufacturing precision is managed by establishing clear dimensional specifications and tolerances for the asymmetric components, allowing standardized production processes to achieve the required precision levels.
Data Source
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AI summary
The present disclosure relates to a secondary battery and a battery pack to prevent a local degradation phenomenon. To this end, a secondary battery may include a case, an electrode assembly disposed inside the case and having a first electrode and a second electrode, a first tab member connected to the first electrode and extending from the electrode assembly in a first direction, a cap assembly disposed to face the electrode assembly and having a first terminal and a second terminal, and a first connection member disposed between the electrode assembly and the cap assembly and connected to the first terminal and the first tab member, wherein the first connection member is formed asymmetrically with a first terminal axis passing through the first terminal in the first direction.