Battery Electrode Insulating Layers for Short-Circuit Prevention
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Solution Overview
Problem
Lithium secondary batteries face issues of short circuits due to direct contact between uncoated portions of the cathode and anode, leading to potential ignition and safety hazards, and manufacturing processes can cause electrode fractures at the boundary between coated and uncoated regions.
Innovation Solution
The electrode design includes insulating layers on both surfaces of coated and uncoated portions, with varying lengths and positions to prevent direct contact and distribute stress, thereby preventing shorts and reducing electrode fractures during manufacturing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If uncoated portions are provided as electrode tabs for electrical connection, then electrical conductivity and ease of connection are improved, but the risk of direct contact between anode and cathode increases causing short circuits and safety hazards
Solution Approach 1:
An insulating layer is introduced as an intermediary substance between the uncoated portion of the electrode and the opposing electrode. This insulating layer prevents direct electrical contact while allowing the uncoated portion to maintain its function as an electrical connection point, thus resolving the contradiction between ease of electrical connection and short circuit risk
2Quantity of substance
If rolling process is applied to adjust electrode density, then electrode density and energy density are improved, but electrode fracture at boundary between coated and uncoated portions occurs
Solution Approach 1:
The insulating layer is formed on the uncoated portion before the rolling process. This preliminary action prepares the uncoated portion to better withstand the mechanical stresses of rolling, preventing fracture at the boundary between coated and uncoated portions while still achieving the desired electrode density
Data Source
AI summary
The present disclosure relates to an electrode for a secondary battery and a secondary battery comprising the same. The present disclosure is to provide an electrode which may prevent a short between electrodes in a secondary battery and to improve safety of a battery by preventing a short between an anode and a cathode.