Secondary Battery Electrode Plate Edge Structure Against Short Circuits
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Solution Overview
Problem
Existing secondary battery electrode plates are prone to short circuits due to the detachment of thick-walled parts formed during laser cutting, which can damage the separator and lead to electrical failures.
Innovation Solution
The electrode plate design features a core body with a thick-walled part having a larger thickness than the central region, comprising a non-melted and melted solidified portion, where the average maximum diameters of metal crystal grains in the non-melted part are smaller than in the melted part, and a specific width ratio is maintained to prevent easy detachment, thereby reducing the risk of short circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the core body is cut by irradiation of an energy beam such as a laser, then the cutting process is efficient and precise, but a thick-walled part is generated in the cut portion which can be easily detached and cause short circuits
Solution Approach 1:
The invention creates a non-uniform thickness distribution in the thick-walled part by controlling laser cutting parameters. The thick-walled part has a gradient structure where the thickness varies from the center to the edge, with the center being thicker than the edge. This local quality variation prevents easy detachment while maintaining cutting efficiency.
Solution Approach 2:
The invention controls the laser cutting parameters (power, speed, focus position) to achieve specific thermal effects that create the desired thick-walled part structure. By adjusting these parameters, the melting and solidification process produces a controlled thickness distribution that prevents detachment while maintaining manufacturing efficiency.
2Ease of manufacture
If the thick-walled part is formed with large crystal grains in the melted portion, then the solidification process is simplified, but the detachment resistance decreases and short circuit risk increases
Solution Approach 1:
The invention optimizes laser cutting parameters to control crystal grain size in the thick-walled part. By adjusting laser power, scanning speed, and focus position, the cooling rate during solidification is controlled to produce fine crystal grains in critical regions. This increases detachment resistance while maintaining a relatively simple solidification process.
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
This configuration enhances the reliability of secondary batteries by preventing short circuits between the positive and negative electrode plates, ensuring a more stable and efficient energy storage solution.
Implementation Method 1
When an electrode original plate is cut by irradiation of an energy beam such as a laser, the core body is melted by the irradiation of the energy beam and a melted portion is solidified.
Implementation Method 2
the core body is melted by the irradiation of the energy beam and a melted portion is solidified
Implementation Method 3
The melted core body is solidified with it being rounded due to surface tension. Thus, a thick-walled part having a larger thickness than that in a central region of the core body is generated in a cut portion of the core body.
Data Source
AI summary
A positive electrode plate that has a positive electrode active material layer formed on a positive electrode core, wherein the positive electrode core has, on an edge side, a thick portion which has a thickness that is greater than the thickness of a portion of the positive electrode core that has the positive electrode active material layer formed on both sides, and the positive electrode plate has a first region that extends into the thick portion from the portion of the positive electrode core that has the positive electrode active material layer formed on both sides and a second region that is positioned outside the first region in the thick portion. The average maximum diameter of the metal crystal grains that compose the first region is smaller than those of the second region.