Symmetric Multi-Tab Battery Layout for Insulation and Low Resistance
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Solution Overview
Problem
Existing secondary batteries face challenges in maintaining high insulation levels between multi-tabs of electrode assemblies, leading to potential electrical short-circuits and reduced coupling reliability.
Innovation Solution
The first and second multi-tabs of the electrode assemblies are designed to be symmetrically extended and bent from regions adjacent to the case to the electrode terminals, with insulation plates positioned between them to prevent short-circuits and improve coupling reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single tab is provided at one end of the battery, then the battery structure is simple, but the current density becomes concentrated and internal resistance increases
Solution Approach 1:
The battery tabs are segmented into multiple separate tabs (first tab and second tab) instead of using a single tab. This segmentation distributes the current collection points along the electrode, reducing current density concentration and lowering internal resistance while maintaining structural simplicity
2Reliability
If multiple tabs are provided to reduce internal resistance, then current distribution improves, but the battery structure becomes complex
Solution Approach 1:
Multiple tabs are strategically positioned at different locations along the electrode (first tab at first location, second tab at second location) rather than uniformly distributed. This local quality approach optimizes current collection at specific high-density areas while keeping the overall structure relatively simple
3Ease of operation
If tabs are extended beyond the battery case, then external connection is facilitated, but the battery appearance is bulky and aesthetic quality deteriorates
Solution Approach 1:
The tabs are nested within the battery case structure, with tab extensions contained within the case boundaries. This nesting approach allows external connections to be facilitated while maintaining a compact, aesthetically pleasing battery appearance without protruding elements
Data Source
Figure 1A
Figure 1B
Figure 1C
AI summary
Various embodiments of the present invention relate to a secondary battery having symmetric multi-tabs, and the technical problem to be solved is providing a secondary battery capable of increasing the insulation level of first and second multi-tabs by forming the first and second multi-tabs of first and second electrode assemblies to be symmetric to each other. To this end, the present invention provides a secondary battery comprising: a case; a first electrode assembly accommodated inside the case and having first multi-tabs; a second electrode assembly accommodated in parallel with the first electrode assembly inside the case and having second multi-tabs; and a cap plate closing the case and having electrode terminals electrically connected to the first and second multi-tabs of the first and second electrode assemblies, wherein the first and second multi-tabs are formed so as to be symmetrical with respect to the boundary area between the first and second electrode assemblies.