Secondary Battery Tab Insulation for Short-Circuit Prevention
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Solution Overview
Problem
Secondary batteries face issues with short circuits between the electrode tab and the case, which can reduce their capacity and efficiency.
Innovation Solution
The implementation of insulating members attached to the electrode tabs and the case to prevent short circuits, allowing for a wider electrode assembly accommodation space and improved capacity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If insulating members are attached to the electrode tabs and case, then short circuit prevention is improved, but device complexity increases
Solution Approach 1:
An insulating member is introduced as an intermediary component between the electrode tab and the case to prevent direct contact and short circuits. The insulating member is attached to the electrode tab and extends into the case, creating a physical barrier that isolates conductive parts without requiring fundamental redesign of the battery structure.
2Reliability
If insulating members are attached to the electrode tabs and case, then short circuit prevention is improved, but manufacturing complexity increases
Solution Approach 1:
The insulating member is pre-formed with a specific shape including an extension portion that fits into the case and a main body that attaches to the electrode tab. This preliminary preparation allows for simplified assembly during manufacturing, as the insulating member can be directly attached to the electrode tab before case assembly, eliminating the need for complex in-situ insulation processes.
3Quantity of substance
If electrode assembly accommodation space is increased, then battery capacity is improved, but case volume requirements increase
Solution Approach 1:
The insulating member utilizes the vertical dimension by extending from the electrode tab into the case depth direction. This three-dimensional configuration allows the insulating function to be achieved without significantly increasing the horizontal footprint or overall case volume, thereby maintaining battery compactness while enabling larger electrode assembly accommodation space.
Data Source
AI summary
A secondary battery includes: an electrode assembly including an electrode stack including a first electrode, a separator, and a second electrode; a first electrode tab and a second electrode tab protruding from a top surface of the electrode stack; a first insulating member attached to the top surface of the electrode stack, a first surface of the first electrode tab, and a first surface of the second electrode tab; a second insulating member attached to a rear surface of the electrode stack, a second surface of the first electrode tab, and a second surface of the second electrode tab; a case having one opened surface, and to accommodate the electrode assembly; and a case cover to cover the opened surface of the case to seal the electrode assembly from the outside.