Cylindrical Battery Bent Lead-out Portion
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Solution Overview
Problem
Cylindrical batteries with thin and low-rigidity electrode cores face challenges in reducing internal resistance due to inadequate joining of collector plates, particularly in non-aqueous electrolyte secondary batteries.
Innovation Solution
A cylindrical battery design featuring a wound electrode body with a first electrode plate and a second electrode plate, where the electrode core is formed of conductive material with a lead-out portion bent towards the radial inner or outer side, allowing for improved contact with the pole terminal and collector plate, thereby reducing internal resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If a thin and low-rigidity core is used in non-aqueous electrolyte secondary batteries, then the battery structure can be more compact and flexible, but the collector plate and core may fail to be joined in a favorable manner, resulting in high internal resistance
Solution Approach 1:
The invention transforms the connection from a single-point contact to a multi-dimensional contact system by creating a bent lead-out portion that extends in multiple directions (radially inward, radially outward, and axially), allowing the collector plate to contact the core at multiple locations and angles, thereby improving joining reliability without increasing core thickness
Solution Approach 2:
The lead-out portion is bent into a curved configuration rather than remaining straight, allowing it to conform to the curvature of the wound electrode body and achieve better contact with the collector plate. The bent shape enables the thin core to maintain reliable electrical connection despite its low rigidity
2Device complexity
If collector leads are used to connect electrode plates, then the battery structure is simple, but the connection paths are small and internal resistance becomes high
Solution Approach 1:
The invention expands the connection path from a one-dimensional collector lead to a two-dimensional bent lead-out portion that contacts the collector plate over a larger area. The bent configuration creates multiple contact points and broader contact surfaces, significantly increasing the effective connection area and reducing electrical resistance while maintaining structural simplicity
3Strength
If resistance welding is used to join the collector plate to the electrode plate edge, then the connection is strong, but the process is complex and may not work well with thin, low-rigidity cores
Solution Approach 1:
The bent lead-out portion acts as an intermediary element between the collector plate and the thin core. It provides a larger contact area and better mechanical interlocking, allowing for simpler joining methods such as pressure contact or spot welding rather than requiring full resistance welding, thereby easing manufacturing while maintaining strong connections
Solution Approach 2:
The curved bent portion of the lead-out can be formed through simple bending or shaping processes during manufacturing, avoiding complex welding operations. The curvature allows the thin core to be shaped and connected more easily, improving manufacturability while maintaining connection strength
Data Source
AI summary
A battery comprises a first polarity terminal that is attached via a first insulating member to an opening of an outer case. A first polarity plate includes: a first core formed of a conductive material; and a first active material layer. A first drawn-out portion is formed from a side of the first core on the first polarity terminal side thereof being drawn further out than a side of the first active material layer on the first polarity terminal side thereof. The first drawn-out portion includes a first bent portion that is bent towards the radially inner or outer side of the electrode body. A first surface of a first polarity collector plate contacts the surface of the first bent portion on the first polarity terminal side, and the first polarity terminal connects directly or via a conductive member to a second surface of the first polarity collector plate.