Cross-Fiber Electrode Plate Structure to Prevent Cracking
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Solution Overview
Problem
Current methods for increasing the degree of fiberization of active materials on electrode plates, such as PTFE, result in poor strength and are prone to cracking, with issues like anisotropic fiberization and structural damage during processing.
Innovation Solution
A manufacturing method involving the stacking of active material films with perpendicular fiberization directions and the application of conductive glue between them, followed by rolling and thinning, to create a fibrous network structure that enhances mechanical strength and reduces cracking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If conventional fiberization methods (baking, high-speed stirring, airflow grinding) are used to increase PTFE fiberization, then the degree of fiberization is improved, but the electrode plate strength deteriorates and cracking occurs
Solution Approach 1:
The active material is divided into multiple thin films (first active material film and second active material film) with different fiberization directions, rather than using a single thick film. This segmentation allows each film to contribute to fiberization while maintaining individual structural integrity, preventing cracking in the final electrode plate.
Solution Approach 2:
The invention creates a composite structure by stacking multiple active material films with perpendicular fiberization directions. This composite approach combines the benefits of fiberization from each film while the perpendicular arrangement distributes stress, preventing the cracking that occurs with conventional single-direction fiberization methods.
2Quantity of substance
If multiple folding and rolling are used to improve fiberization, then the electrode plate density is improved, but the electrode plate becomes difficult to thin
Solution Approach 1:
Instead of using multiple folding and rolling operations on a single thick film, the invention segments the active material into multiple thin films from the beginning. Each film is processed independently to the required thinness, and then stacked together. This approach achieves high density through stacking while maintaining ease of thinning for each individual film.
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 method improves the mechanical strength of electrode plates by creating a uniform fiberization network, reducing surface resistance, and enabling efficient mass production with improved thickness control and reduced cracking.
Implementation Method 1
applying a conductive glue between the two adjacent active material films
Implementation Method 2
subjecting the mixed powder to shaping in a roller press to obtain the active material film
Implementation Method 3
Rolling the stacked at least two active material films to obtain an electrode film
Implementation Method 4
a flat plate hot press is used for combination. The surface temperature of the flat plate hot press is 185° C., and the pressure is 2-6.7 MPa
Data Source
AI summary
The present invention discloses an electrode plate, a manufacturing method therefor and a battery. The manufacturing method for an electrode plate comprises: obtaining at least two active material films; stacking the at least two active material films, the fiberization directions of the two adjacent active material films being perpendicular to each other or forming an included angle, and applying a conductive glue between two adjacent active material films; rolling the stacked at least two active material films to obtain an electrode film; and combining the electrode film with a current collector to obtain the electrode plate. The manufacturing method of the present disclosure can improve the strength of the electrode film, and thus the electrode film is not prone to cracking. The included angle is formed between the fiberization directions of the two adjacent active material films, so that the electrode plate is prone to cracking are solved.