Continuous Casting Drum Notches for Carbon Fiber Battery Electrodes
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Solution Overview
Problem
Existing continuous casting machines for lead-acid battery grids face issues such as flashing, incomplete filling of mold grooves, and reduced structural quality due to cold-welded seams, leading to poor current carrying capacity, especially during high-speed and long-duration production.
Innovation Solution
A machine and method for continuous casting of composite battery electrodes with a carbon fiber material electrically connected to a continuous cast lead conductor, using a drum and shoe configuration with circumferentially continuous mold cavities and notches to prevent bowing and ensure complete filling, thereby improving structural integrity and production efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If continuous casting is operated at high speed for increased productivity, then production rate improves, but structural quality deteriorates due to cold-welded seams and flashing
Solution Approach 1:
The patent modifies the geometric parameters of the mold cavity, specifically adding notches to the circumferentially continuous mold cavity in the drum. These notches change the flow parameters of molten lead, ensuring complete filling of the cavity at high casting speeds while preventing flashing. The notches create controlled turbulence and improve molten lead distribution, maintaining structural quality (homogeneous fused joints) even at elevated production rates.
2Manufacturing precision
If mold cavity filling is increased to prevent undersized grid wires, then wire size improves, but flashing between grooves occurs
Solution Approach 1:
The patent segments the circumferentially continuous mold cavity by introducing notches that divide the cavity into distinct filling zones. This segmentation controls the flow path of molten lead, ensuring complete filling of each segment (preventing undersized wires) while the notches themselves act as barriers that contain the molten lead within the cavity (preventing flashing between grooves).
3Ease of operation
If casting temperature is elevated to maintain molten lead flow, then fluidity improves, but structural integrity deteriorates due to cold welded seams
Solution Approach 1:
The notches in the mold cavity perform a preliminary action by creating controlled turbulence and eddies in the molten lead flow before the lead enters the main casting zone. This preliminary mixing action ensures uniform temperature distribution and complete cavity filling, allowing the use of lower casting temperatures that promote homogeneous fusion and eliminate cold-welded seams while maintaining adequate fluidity.
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 enables the production of high-quality carbon fiber electrodes with improved structural integrity and current carrying capacity, allowing for higher production rates and reduced defects, even at elevated temperatures and prolonged operation.
Implementation Method 1
a shoe of a highly thermally conductive metal such as aluminum-bronze or steel positioned in confronting and close-fitting relationship with an arcuate segment of the drum
Implementation Method 2
excess molten lead is supplied at a super atmospheric pressure to the orifice slot to fill the portion of the mold of the drum rotating past the slot
Implementation Method 3
homogeneously fused joint of the lug with the adjacent wire portions of the cast lead-acid grid
Data Source
AI summary
For making battery electrodes, a composite strip of a cast ribbon of an electrically conductive metal attached to and extending along an edge of a web of electrically conductive carbon fiber material, also called a carbon felt in some examples, with a plurality of spaced apart notches cast in the ribbon and opening to an edge of the ribbon spaced from the carbon fiber material. A rotatable drum with a mold cavity and a confronting casting shoe for supplying molten metal, such as liquid lead, to the cavity may be used in a casting machine to continuous cast the composite strip.