Electrode Sheet Induction Heating for Binder Flotation Removal
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Solution Overview
Problem
Existing electrode sheet processing methods fail to effectively address binder flotation during drying, leading to poor wettability, increased internal resistance, and potential separator piercing, which affects battery performance and safety.
Innovation Solution
An electromagnetic induction heating system is used to soften or ablate the floating binder on the electrode sheet surface, creating pores and reducing edge burrs, while aligning conductive agents for improved conductivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If electromagnetic induction heating is applied to soften or ablate floating binder, then electrolyte infiltration rate increases and sheet resistance decreases, but the risk of current collector deformation increases due to high temperature
Solution Approach 1:
The patent applies electromagnetic induction heating to specifically heat the active layer where binder flotation occurs, while the current collector remains relatively cool due to its thermal mass and lower electromagnetic absorption. This localized heating approach allows binder softening/ablation at the active layer surface without causing current collector deformation, resolving the contradiction between improving electrolyte infiltration and preventing temperature-related damage.
Solution Approach 2:
The patent controls the electromagnetic induction heating parameters (frequency, power, duration) to achieve sufficient heating of the active layer for binder treatment while limiting the temperature rise of the current collector. By optimizing these parameters, the process achieves binder removal for improved electrolyte infiltration while maintaining current collector structural integrity.
2Reliability
If electromagnetic induction heating is used to ablate binder and create pores, then porosity increases improving electrolyte infiltration, but manufacturing complexity increases due to additional equipment requirements
Solution Approach 1:
The patent replaces traditional mechanical or chemical binder removal methods with electromagnetic induction heating. This substitution uses electromagnetic fields to directly heat and ablate the binder, creating pores and improving porosity without requiring complex mechanical drilling equipment or chemical treatment systems, thus achieving improved electrolyte infiltration with relatively simple equipment.
3Productivity
If high current density is applied at the surface for rapid heating, then binder ablation efficiency increases, but energy consumption increases
Solution Approach 1:
The patent employs periodic or pulsed electromagnetic induction heating rather than continuous heating. By applying electromagnetic energy in controlled pulses, the system achieves rapid surface heating for efficient binder ablation during the pulse duration, then allows cooling periods that reduce overall energy consumption. This periodic action maintains high ablation efficiency while managing energy usage.
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
Enhances electrolyte infiltration, reduces sheet resistance, and mitigates separator piercing risks, resulting in better battery performance and safety.
Implementation Method 1
the induction coil is configured to generate alternating magnetic induction lines parallel to the electrode sheet
Implementation Method 2
the alternating current tends to flow along the surface of the electrode sheet, with a higher current density at the surface of the electrode sheet and a lower current density inside the electrode sheet, where the current is primarily concentrated at the surface of the electrode sheet, and at a position closer to the surface, the current density is higher, producing a 'skin effect'
Implementation Method 3
perform electromagnetic induction heating treatment on the electrode sheet
Implementation Method 4
softening (melting) or ablating the binder can also reduce various burrs and particles at edges of the active layer
Data Source
AI summary
An electrode sheet processing system and a method for processing an electrode sheet. The electrode sheet processing system includes: an electromagnetic induction heating unit, where the electromagnetic induction heating unit is configured to perform electromagnetic induction heating treatment on an electrode sheet. The method comprises performing electromagnetic induction heating treatment on the electrode sheet to make sure that a surface temperature of an active layer of the electrode sheet is greater than or equal to a softening temperature or a melting temperature of a binder of the electrode sheet and that a temperature of a current collector of the electrode sheet is less than a deformation temperature of the current collector.