Cylindrical Battery Terminal Layout for Easier Top-Side Connection
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Solution Overview
Problem
The existing cylindrical secondary battery structure requires complex electrical connections due to opposite orientations of positive and negative electrode terminals, increasing component count and structural complexity, and lacks sufficient area for welding, affecting sealability and energy density.
Innovation Solution
A cylindrical secondary battery design where the positive and negative electrode terminals are aligned in the same direction, with a battery can having varying thicknesses and a penetrating terminal connected to the first uncoated region, allowing for improved sealability and energy density through optimized thickness adjustments and insulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the positive electrode terminal and negative electrode terminal are disposed on opposite sides of the cylindrical secondary battery, then the electrical connection structure requires busbars and insulation components at both top and bottom, but this increases device complexity and component count
Solution Approach 1:
The patent combines both positive and negative electrode terminals at the top cap, merging functions that were previously separated at top and bottom. This consolidation eliminates the need for separate bottom electrical connections and reduces the number of insulation and waterproofing components required, directly resolving the technical contradiction between ease of electrical connection and device complexity
Solution Approach 2:
The patent transitions from a vertical distribution of terminals (top and bottom) to a horizontal arrangement at the same level (both at top cap). This dimensional reorganization allows both terminals to be accessed from one side, simplifying the electrical connection structure without compromising functionality
2Reliability
If the positive electrode terminal and negative electrode terminal are disposed on opposite sides, then electrical connection is achieved, but insulation and waterproofing components must be applied to both top and bottom, increasing structural complexity
Solution Approach 1:
By merging both terminals at the top cap, the patent consolidates the locations requiring insulation and waterproofing components from two locations (top and bottom) to one location (top cap only). This reduces structural complexity while maintaining electrical connection reliability through the cap plate structure
3Reliability
If the battery can thickness is increased to improve sealability, then sealability is enhanced, but energy density decreases due to reduced active material space
Solution Approach 1:
The patent applies different thicknesses of the battery can at different locations: thicker at the top cap where sealing is critical, and thinner at the sidewalls where space for active material is prioritized. This localized quality differentiation resolves the contradiction by providing enhanced sealability only where needed while maximizing energy density in the bulk of the battery structure
Data Source
AI summary
A cylindrical secondary battery includes an electrode assembly including a first uncoated region having a first polarity and a second uncoated region having a second polarity, a battery can accommodating the electrode assembly, the battery can electrically connected to the second uncoated region, the battery can having different thicknesses, the battery can having a penetrating terminal electrically connected to the first uncoated region through a surface of the battery can, and a cap plate configured to close the open portion of the battery can.