Rotatable Negative Tab Cylindrical Battery Cell Preventing Collapse
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Solution Overview
Problem
Cylindrical battery cells experience shape collapse and potential short circuits due to repeated charging and discharging, which deform the electrode assembly and cause stability issues.
Innovation Solution
A cylindrical battery cell design featuring a negative electrode tab structure that includes a first tab fixed to the battery can and a second tab that rotates within a central opening of an insulator, converting deformation forces into rotational motion to prevent collapse and short circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the electrode assembly is stored inside the cylindrical battery can, then the battery structure is compact and stable, but the electrode assembly cannot be deformed outside the battery can, causing shape collapse and short circuits during repeated charging and discharging
Solution Approach 1:
The patent introduces a rotatable negative electrode tab that can dynamically adjust its position during charging and discharging cycles. When the electrode assembly expands or contracts, the negative electrode tab rotates around the central axis of the battery can, allowing the deformation forces to be accommodated through rotational motion rather than causing shape collapse. This dynamic mechanism maintains structural stability while preventing short circuits.
2Adaptability or versatility
If the positive electrode plate or negative electrode plate is deformed toward the center of the electrode assembly during repeated charging and discharging, then the electrode plates can accommodate length changes, but the shape of the electrode assembly collapses causing short circuits
Solution Approach 1:
The negative electrode tab is designed to rotate dynamically in response to electrode plate deformation. As the positive or negative electrode plate changes length during charging and discharging, the negative electrode tab rotates around the battery can's central axis, converting linear deformation into rotational motion. This prevents the electrode assembly from collapsing while accommodating the necessary dimensional changes.
Solution Approach 2:
The negative electrode tab acts as an intermediary mechanism between the electrode plates and the battery can. Instead of allowing direct deformation of the electrode assembly shape, the rotatable tab mediates the deformation process by absorbing dimensional changes through rotation, thereby protecting the overall structure from collapse.
3Length of stationary object
If the electrode plates are constrained within the battery can, then the battery maintains a fixed external shape, but internal deformation causes folding toward the center leading to short circuits
Solution Approach 1:
The patent transforms the static constraint system into a dynamic one by introducing the rotatable negative electrode tab. The battery can maintains its fixed external dimensions, while the internal negative electrode tab rotates to accommodate electrode plate deformation. This dynamic element allows internal dimensional changes without compromising the external shape or causing harmful folding.
Data Source
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AI summary
Disclosed are a cylindrical battery cell, and a battery pack and a vehicle including the same. A cylindrical battery cell according to an embodiment of the present disclosure includes an electrode assembly having a structure in which a positive electrode plate provided with a positive electrode tab, a negative electrode plate provided with a negative electrode tab, and a separator interposed between the positive electrode plate and the negative electrode plate are wound in one direction, and having a center hole formed therein; a cylindrical battery can configured to store the electrode assembly with an electrolyte injected thereinto; and an insulator for electrical insulation having a central opening formed therein and disposed on a side of the negative electrode tab, wherein at least a part of the negative electrode tab is configured to rotate according to a change in the electrode assembly during charging and discharging.