Cylindrical Battery Current Collector Fuse Layout for Separator Protection
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Solution Overview
Problem
The challenge of preventing foreign substances generated when a fusing portion is cut off from flowing into the jelly-roll type electrode assembly in cylindrical battery cells, which can lead to separator damage and internal short circuits, is addressed by appropriately adjusting the position of the fusing portion in the current collector plate.
Innovation Solution
A cylindrical battery cell design with a current collector plate that includes a fusing portion configured to be cut off during overcurrent, positioned to prevent foreign substances from entering the electrode assembly, and a battery pack and vehicle incorporating this design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a fusing portion is formed on the current collector plate to protect from overcurrent, then safety against overcurrent is improved, but foreign substances may flow into the electrode assembly causing separator damage and internal short circuits
Solution Approach 1:
An insulator is introduced as an intermediary component between the current collector plate and the electrode assembly. This insulator prevents foreign substances generated during fusing portion cutoff from directly contacting and damaging the separator, while still allowing the fusing portion to perform its overcurrent protection function.
Solution Approach 2:
The insulator is positioned in advance to cushion or protect the electrode assembly from potential harmful effects. By placing the insulator before the fusing portion cutoff occurs, it creates a protective barrier that prevents foreign substances from causing damage, addressing the problem proactively rather than reactively.
2Reliability
If the fusing portion is positioned closer to the electrode assembly to improve protection, then overcurrent response is improved, but the risk of foreign substances damaging the separator increases
Solution Approach 1:
The insulator serves as a mediator that allows the fusing portion to be positioned close to the electrode assembly for effective overcurrent protection, while simultaneously preventing foreign substances from reaching and damaging the separator. The insulator decouples the spatial relationship between the fusing portion and the electrode assembly.
3Object-affected harmful factors
If the fusing portion is positioned farther from the electrode assembly to prevent foreign substance contamination, then separator safety is improved, but overcurrent protection effectiveness is reduced
Solution Approach 1:
The insulator enables the fusing portion to maintain an optimal distance from the electrode assembly - far enough to minimize foreign substance contamination risk, yet close enough to provide effective overcurrent protection. The insiator acts as a bridge that reconciles the conflicting spatial requirements.
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
This design effectively prevents foreign substances from entering the electrode assembly, enhancing the safety and reliability of the battery cell and pack, and improving the vehicle's performance.
Implementation Method 1
a fusing portion configured to be cut off when an overcurrent flows
Data Source
AI summary
A cylindrical battery cell, a battery pack and a vehicle including the same are provided. The cylindrical battery cell includes an electrode assembly having a first electrode plate and a second electrode plate wound in one direction with a separator being interposed therebetween, the first electrode plate including a first uncoated region in which an active material layer is not coated at an end of a long side, the first uncoated region providing a plurality of winding turns with respect to a center of the electrode assembly; a battery can having an open portion and a partial closed portion provided at a side opposite of the open portion; a current collector plate electrically connected to the first uncoated region of the first electrode plate and having a fusing portion that is cut off when an overcurrent flows; and a cell terminal.