Rechargeable Battery Insulating Tape Preventing Electrode Short-Circuits
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Solution Overview
Problem
High-capacity rechargeable batteries face safety issues due to the potential for initial short-circuits between the positive and negative electrodes, especially when the positive electrode's uncoated region is extended for improved conductive member penetration, making it challenging to maintain safety while enhancing penetration characteristics.
Innovation Solution
A rechargeable battery design featuring a spirally wound electrode assembly with a separator between electrodes, where an insulating laminating tape is strategically placed between the second electrode tab and the uncoated region of the first electrode at the terminal end, preventing electrical contact and enhancing safety while improving penetration characteristics by controlling the alignment of electrode tabs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the uncoated region of the positive electrode is extended to improve conductive member penetration, then penetration characteristics are improved, but the risk of initial short-circuit between positive and negative electrodes increases
Solution Approach 1:
An insulating member is introduced as an intermediary between the extended uncoated region of the positive electrode and the negative electrode tab. This insulating member prevents direct electrical contact while allowing the conductive member to penetrate through the uncoated region, thus resolving the contradiction between improved penetration characteristics and safety prevention.
Solution Approach 2:
The electrode structure is segmented into coated regions and uncoated regions, with the insulating member further segmenting the potential contact path. This segmentation allows the uncoated region to extend for better penetration while the insulating member creates a separate protective layer that prevents short-circuiting.
2Ease of operation
If the uncoated region of the positive electrode is extended, then penetration characteristics are improved, but the complexity of preventing short-circuit increases
Solution Approach 1:
The insulating member serves as a simple intermediary component that adds minimal structural complexity while effectively preventing short-circuit. It is positioned between the positive and negative electrodes in the uncoated region, providing a straightforward solution without requiring complex mechanisms.
Solution Approach 2:
The insulating member is implemented as a thin film or laminate structure that provides electrical insulation without adding significant bulk or complexity. This thin film approach maintains the simplicity of the overall battery structure while effectively preventing short-circuit between electrodes.
Data Source
AI summary
A rechargeable battery that includes: an electrode assembly with a first electrode and a second electrode that include uncoated regions and coated regions; a case; a first electrode tab and a second electrode tab coupled to the first and second electrodes; and a laminating tape attached to opposite surfaces of a front end portion disposed at a center of the electrode assembly and opposite surfaces of a terminal end portion disposed at an outermost side of the electrode assembly. The second electrode tab is coupled to the uncoated region of the second electrode toward the uncoated region of the first electrode in the terminal end portion that is disposed at the outermost side of the electrode assembly, the first electrode tab is coupled to the uncoated region of the first electrode while being disposed closer to the coated region than the second electrode tab in the terminal end portion that is disposed at the outermost side of the electrode assembly, and an insulating laminating tape for preventing the second electrode tab and the uncoated region of the first electrode from electrically contacting each other is further included.