Secondary Battery Electrode Core Positioning for Short Circuit Prevention
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Solution Overview
Problem
Secondary battery electrodes formed by cutting with a pulsed-system laser often result in core body protrusions at cut ends, leading to short circuits between positive and negative electrodes in multilayer-type batteries.
Innovation Solution
A secondary-battery electrode with a thin-plate-shaped core body and active material layers, where the core body end is positioned inward or flush with the active material layer end, and a manufacturing method using a continuous wave laser to cut and remove protrusions at the cut ends, preventing short circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a pulsed-system laser is used to cut the electrode precursor, then the cutting process is completed, but the core body protrudes outward at the cut end portion causing short circuits
Solution Approach 1:
The patent applies preliminary action by first cutting the electrode precursor with a continuous wave laser to prevent core body protrusion, then subsequently removing active material layer protrusions. This sequential approach ensures the core body is properly shaped before final trimming, preventing short circuits while maintaining productivity
Solution Approach 2:
The patent changes the laser system parameter from pulsed-mode to continuous wave mode for the cutting process. This parameter change fundamentally alters the cutting mechanism to prevent core body protrusion at the cut end, thereby eliminating the short circuit issue while maintaining effective cutting
2Reliability
If the core body end is positioned inward relative to the active material layer end, then short circuits are suppressed, but the manufacturing process becomes more complex
Solution Approach 1:
The patent uses parameter changes by switching to continuous wave laser cutting, which inherently produces clean cuts without core body protrusion. This eliminates the need for complex post-processing or additional alignment steps, achieving reliable short circuit suppression while keeping the manufacturing process relatively simple
Solution Approach 2:
The patent replaces mechanical cutting methods or pulsed laser cutting with continuous wave laser cutting. This substitution provides inherent control over the cut geometry, ensuring the core body end is properly positioned without requiring complex mechanical fixtures or multiple processing steps
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 effectively suppresses short circuits between adjacent electrodes, enhancing the reliability and performance of secondary batteries by ensuring proper alignment and contact between electrode layers.
Implementation Method 1
cutting an electrode precursor by a first continuous wave laser
Implementation Method 2
a first step of cutting an electrode precursor by a first continuous wave laser
Data Source
AI summary
An object is to provide a secondary-battery electrode that is capable of suppressing a short circuit between adjacent positive and negative electrodes when the secondary-battery electrode is applied to an electrode body of a secondary battery. A secondary-battery electrode (10) includes a thin-plate-shaped metal core body (11) and an active material layer (12a, 12b) containing an active material and formed on two surfaces of the core body (11). In a cut end portion (15) of the electrode, an end portion (16) of the core body (11) is positioned inward of an end portion (17a, 17b) of the active material layer (12a, 12b) in a surface direction Y of the electrode.