Multi-Stage Induction Heating for Electrode Rolling Camber Control
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Solution Overview
Problem
The increase in the loading amount of the electrode mixture layer in secondary batteries leads to volume increase and process defects, particularly camber generation on the non-coated part of the electrode substrate during high-pressure rolling.
Innovation Solution
A multi-stage induction heating process using first and second induction heating units to selectively heat the coated and non-coated parts of the electrode substrate before and after rolling, with specific temperature and pressure conditions to reduce stress and uniformize the stretch.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the loading amount of the electrode mixture layer is increased, then the capacity of the secondary battery is improved, but the volume of the electrode increases
Solution Approach 1:
The patent applies induction heating to change the temperature parameter of the electrode substrate, which modifies the physical properties of the material to achieve volume reduction without sacrificing loading amount. The thermal energy input enables restructuring or densification of the electrode layers.
2Volume of moving object
If the electrode is rolled with higher pressure, then the volume of the electrode is reduced, but cambers are generated on the non-coated part region
Solution Approach 1:
The patent applies induction heating as a preliminary action before rolling. By pre-heating the electrode substrate, the material becomes more pliable and easier to compress uniformly, which enables volume reduction through rolling without generating cambers on the non-coated regions.
Solution Approach 2:
The patent changes the temperature parameter of the electrode substrate using induction heating, which fundamentally alters the material's mechanical properties. This temperature change enables subsequent rolling to achieve volume reduction without the harmful side effect of camber generation.
3Volume of moving object
If the electrode is rolled with higher pressure, then the volume of the electrode is reduced, but the process defect rate increases
Solution Approach 1:
The patent applies induction heating as a preliminary treatment before rolling. This pre-heating action prepares the electrode substrate by modifying its thermal and mechanical properties, enabling subsequent high-pressure rolling to achieve volume reduction without increasing the process defect rate.
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
Significantly reduces camber generation and process defects, enhancing manufacturing efficiency and winding capacity.
Implementation Method 1
a first induction heating unit configured to induction-heat an electrode substrate; an electrode rolling unit configured to roll the first induction-heated electrode substrate; and a second induction heating unit configured to induction-heat the rolled electrode substrate
Data Source
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AI summary
Provided is an electrode rolling apparatus and method for performing a multi-stage induction heating. By use of the apparatus and method, it is possible to prevent camber generation on the non-coated part region during the process of rolling an electrode substrate, and it is possible to increase the efficiency of the manufacturing process.