Wound Battery Electrode Tab Structure for Housing Short Isolation
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Solution Overview
Problem
Existing battery designs face issues with internal resistance, short circuit risk, and inefficient energy density due to the arrangement of electrode terminals and empty spaces within the battery housing, which also lead to increased manufacturing complexity and cost.
Innovation Solution
A battery design featuring an electrode assembly with a first and second electrode, separated by a wound separator, where the uncoated regions act as electrode tabs, and an insulator is used to prevent electrical contact between the tabs and the battery housing, minimizing movement and optimizing energy density.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of substance
If a battery is disposed of in a landfill, then it occupies space and potential pollution risk exists, but the valuable materials inside cannot be recovered and are wasted
Solution Approach 1:
The battery is divided into modular units with standardized interfaces, allowing easy separation of individual battery cells from the pack. The battery pack consists of multiple battery modules that can be independently removed and processed, facilitating material recovery while reducing the loss of valuable substances.
Solution Approach 2:
The invention extracts and separates valuable materials from the battery through systematic disassembly. The battery case is designed to be easily opened, allowing extraction of battery cells, electrodes, and other components for material recovery and recycling, thereby preventing loss of valuable substances.
2Reliability
If the battery case is made from a single material for ease of manufacturing and recycling, then production is simplified, but the battery may overheat and cause safety issues
Solution Approach 1:
Different portions of the battery case are made from different materials optimized for their specific functions. The case includes thermally conductive portions for heat dissipation and electrically insulating portions for safety, allowing localized thermal management without requiring complex overall structure.
Solution Approach 2:
The battery case employs composite material construction combining thermally conductive materials and electrically insulating materials in a single integrated structure. This composite approach enables simultaneous thermal management and electrical safety while maintaining relatively simple manufacturing processes.
3Temperature
If the battery case provides excellent thermal conductivity for heat dissipation, then overheating is prevented, but electrical short circuits may occur due to conductivity
Solution Approach 1:
The battery case features localized thermal management with thermally conductive portions positioned at specific heat-generating areas and electrically insulating portions at areas prone to electrical contact. This spatial differentiation of material properties enables effective heat dissipation while preventing electrical short circuits.
Solution Approach 2:
The battery case acts as an intermediary structure between thermally conductive and electrically insulating functions. By incorporating both material types in specific configurations, the case mediates between the need for heat dissipation and the need to prevent electrical short circuits.
Data Source
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AI summary
A battery according to an embodiment of the present disclosure includes an electrode assembly including a first electrode, a second electrode and a separator interposed between the first electrode and the second electrode wound around a winding axis, defining a core and an outer circumferential surface, wherein the first electrode includes a first active material region coated with an active material layer along a winding direction and a first uncoated region not coated with the active material layer, and at least part of the first uncoated region itself is used as an electrode tab; a first current collector coupled to at least part of the first uncoated region on the electrode assembly; a battery housing to accommodate the electrode assembly and the first current collector; and an insulator interposed between an inner surface of the battery housing facing the first uncoated region or the first current collector and the first uncoated region or the first current collector to block the electrical connection between the first uncoated region and the battery housing.