Prismatic Battery Tab Sealing Structure for Higher Energy Density
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Solution Overview
Problem
Existing secondary batteries face challenges in achieving improved energy density and stable manufacturing processes.
Innovation Solution
A secondary battery design comprising an electrode assembly with first and second electrodes, connected to electrode tabs through spacers and insulating sheets, sealed by sealing plates, and housed in a prismatic case with insulating members to enhance energy density and manufacturing stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If electrode tabs are extended outside the case for easy external connection, then ease of operation is improved, but the battery volume increases and energy density decreases
Solution Approach 1:
The electrode tabs are nested inside the case by being received within the sealing plates. The first electrode tab is received in the first sealing plate and the second electrode tab is received in the second sealing plate, allowing external connection while maintaining a compact battery volume.
Solution Approach 2:
Sealing plates serve as intermediary components that provide external connection points while containing the electrode tabs internally. The sealing plates with through-holes allow electrical connection to extend outside the case without increasing the overall battery envelope volume.
2Shape
If electrode tabs are positioned at both ends of the electrode assembly for balanced structure, then shape stability is improved, but manufacturing complexity increases due to multiple connection points
Solution Approach 1:
The sealing plates serve multiple functions: they seal the case openings, provide structural support, accommodate electrode tabs, and enable external electrical connections. This multi-functionality reduces the need for separate components and simplifies the overall manufacturing process despite having connections at both ends.
3Reliability
If insulating components are added to prevent electrical shorting, then reliability is improved, but the battery volume increases and energy density decreases
Solution Approach 1:
The insulating function is merged with the sealing plates by forming insulating protrusions that extend from the sealing plates toward the electrode tabs. This integration provides electrical insulation without requiring separate insulating components, thereby maintaining compact battery volume.
Solution Approach 2:
Thin insulating protrusions are used to provide adequate electrical insulation between conductive components. These thin film-like structures provide the necessary insulation while occupying minimal space within the battery assembly.
Data Source
Figure 1
Figure 2
Figure 3~4
AI summary
The present secondary battery includes: a first spacer (600, 600A, 600B, 600C) disposed to face a first electrode tab (220, 220A); a second spacer (600, 600A, 600B, 600C) disposed to face a second electrode tab (250); and an insulating sheet(700) disposed to cover the electrode assembly (200, 200A), the first spacer (600, 600A, 600B, 600C), and the second spacer (600, 600A, 600B, 600C), wherein the insulating sheet and the first spacer (600, 600A, 600B, 600C) are connected to each other, and the insulating sheet and the second spacer (600, 600A, 600B, 600C) are connected to each other.