Continuous Casting Drum and Shoe for Defect-Free 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 cold welded seams, leading to poor structural quality and reduced current carrying capacity, especially when operating at high speeds over extended periods.
Innovation Solution
A continuous casting machine and method that includes a shoe design with optimized orifice and return slots, along with a series of ribs to control molten lead flow, and the integration of a carbon fiber material with a conductive lead ribbon to form composite electrodes, ensuring homogeneous casting and improved structural integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If continuous casting is operated at high speed over extended periods, then productivity increases, but manufacturing precision deteriorates due to flashing, incomplete filling of mold grooves, and cold welded seams
Solution Approach 1:
The patent modifies physical parameters of the casting system including shoe temperature, drum temperature, and molten lead flow rate to maintain optimal casting conditions at high production speeds, preventing defects while sustaining elevated productivity
Solution Approach 2:
The patent implements monitoring and control mechanisms that track casting quality parameters in real-time and adjust process variables accordingly, ensuring consistent grid wire quality even during extended high-speed operation
2Manufacturing precision
If shoe temperature is increased to prevent cold welded seams, then manufacturing precision improves, but energy consumption increases
Solution Approach 1:
The patent optimizes the shoe temperature parameter to the minimum level required to prevent cold welded seams, balancing quality requirements with energy efficiency by avoiding excessive heating
3Manufacturing precision
If molten lead flow is increased to completely fill mold grooves, then manufacturing precision improves, but harmful factors increase due to lead flashing
Solution Approach 1:
The patent applies different local conditions within the mold cavity, including varied surface finishes and localized cooling zones, to ensure complete groove filling while controlling molten lead behavior and preventing flashing
Solution Approach 2:
The patent supplies molten lead at a flow rate that exceeds the minimum required for filling, ensuring complete groove penetration while the excess lead is controlled and redirected to prevent harmful flashing
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 enhances the production of high-quality lead-acid battery grids by reducing defects, increasing production rates, and improving the metallurgical grain structure, while enabling the cost-effective mass production of carbon fiber electrodes connected to lead conductors.
Implementation Method 1
maintained a temperature sufficient to prevent solidification of the lead in the grooves
Implementation Method 2
a drum rotating at a controlled speed with a mold cavity formed in an outer peripheral surface of the drum
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.