Battery Current Collecting Lead Structure for Low Internal Resistance
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Solution Overview
Problem
Conventional alkaline secondary batteries face challenges in achieving high-rate charge and discharge characteristics due to high internal resistance, which is exacerbated by the use of thin and long positive electrode ribbons, and the alignment requirements for current collecting leads lead to reduced production efficiency.
Innovation Solution
A secondary battery design that incorporates a current collecting lead with a top wall, bottom wall, and side walls, featuring extension parts that are welded to the lid plate, allowing for electrical connection without the need for precise alignment, thereby reducing internal resistance and improving production efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If thin and long positive electrode ribbons are used, then the battery can be manufactured with simpler structure, but the internal resistance increases and high-rate charge and discharge characteristics deteriorate
Solution Approach 1:
The current collecting lead is divided into multiple functional segments: an extension part that contacts the positive electrode ribbon, a body part that provides structural support, and a terminal part that connects to the sealing body. This segmentation allows each part to be optimized for its specific function, reducing overall resistance while maintaining manufacturing simplicity
Solution Approach 2:
The current collecting lead transitions from a two-dimensional thin ribbon to a three-dimensional structure with width, height, and length. The body part rises vertically from the extension part, creating a stepped configuration that reduces resistance by increasing the cross-sectional area for current flow while maintaining a compact footprint
2Reliability
If current collecting lead requires precise alignment with positive electrode ribbon, then connection reliability improves, but production efficiency decreases
Solution Approach 1:
The extension part of the current collecting lead is designed to automatically align with and contact the positive electrode ribbon through its own geometric configuration. The extension part protrudes in a direction substantially perpendicular to the ribbon width direction, creating a self-aligning mechanism that eliminates the need for precise external alignment during assembly
Solution Approach 2:
The current collecting lead is pre-formed with the extension part positioned and oriented before assembly. The extension part is protruded in advance in a direction perpendicular to the ribbon width, so that when the lead is inserted, the extension automatically makes contact with the positive electrode ribbon without requiring complex alignment operations
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution effectively reduces internal resistance and enhances high-rate charge and discharge capabilities while simplifying the manufacturing process by eliminating the need for precise alignment of the current collecting lead, resulting in a more efficient production process.
Implementation Method 1
the extension parts have a welded part including a portion in which a lead protrusion formed out of the top wall by punch press processing protruding to the side of the sealing body is deformed by heat
Implementation Method 2
a current collecting lead interposed between the sealing body and the current collector and joined to the sealing body and the current collector to electrically connect the current collector and the sealing body
Data Source
Figure 1~2
Figure 3~4
Figure 5
AI summary
The secondary battery of the present invention includes a positive electrode current collector (28) attached to an electrode group (4), a sealing body (14) including a lid plate (16) and a positive electrode terminal (22), and a current collecting lead (34) interposed between the positive electrode current collector (28) and the sealing body (14), and joined to the positive electrode current collector (28) and the sealing body (14), in which the current collecting lead (34) has a top wall (50) located on a side of the sealing body (14), a bottom wall (36) facing the top wall (50), and located on a side of the positive electrode current collector (28), and a pair of side walls (42 and 44) extending between a side edge of the top wall (50) and a side edge of the bottom wall (36), and facing each other, and the top wall (50) includes faced parts (52c and 54c) facing the bottom wall 36, and extension parts (52a, 52b, 54a and 54b) extending outward from the faced parts (52c and 54c), and the extension parts (52a, 52b, 54a and 54b) are joined to the lid plate (16).