Elastic Center Pin Structure for Cylindrical Battery Core Stability
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Cylindrical type secondary batteries face issues with electrode assembly collapse and low adhesion force, leading to safety concerns and performance degradation, despite the use of center pins to prevent internal short circuits.
Innovation Solution
A center pin is inserted into the electrode assembly core, supporting it radially on the inner circumferential surface of the battery case with elasticity, and can function as a separate positive or negative electrode tab to enhance adhesion force and reduce resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If a cylindrical secondary battery is charged at a high rate, then charging time is reduced, but internal heat generation increases and can cause thermal runaway
Solution Approach 1:
A cooling plate is introduced as an intermediary component between the battery cells. This cooling plate includes cooling channels that allow coolant to flow through, acting as a mediator to transfer heat away from the battery cells during high-rate charging, thereby enabling fast charging without excessive temperature rise
Solution Approach 2:
The cooling system utilizes hydraulic principles by circulating coolant through channels in the cooling plate. This fluid-based heat removal system efficiently transfers thermal energy from the battery cells to the coolant, allowing high charging rates to be sustained without thermal runaway
2Quantity of substance
If battery cells are arranged closely to increase energy density, then space utilization is improved, but heat dissipation becomes more difficult
Solution Approach 1:
The cooling plate extends in the width direction (second transverse direction) beyond the battery cells, creating a three-dimensional heat dissipation structure. This dimensional extension allows heat to be removed from multiple surfaces and angles, effectively cooling densely packed cells without increasing horizontal spacing
Solution Approach 2:
The cooling plate serves as an intermediary thermal management component that interfaces between the densely arranged battery cells and the coolant system. It provides dedicated heat removal pathways independent of the cell spacing, enabling high energy density while maintaining effective heat dissipation
3Ease of manufacture
If the battery structure is simplified to reduce manufacturing cost, then manufacturing complexity is reduced, but reliability of thermal management may deteriorate
Solution Approach 1:
The cooling plate integrates multiple functions into a single component: it serves as a thermal management system, a structural support element, and a space-filling component. This merging of functions reduces the total number of separate parts and assembly steps while maintaining reliable thermal management through the integrated cooling channels
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
The center pin prevents electrode assembly collapse and increases adhesion force, improving battery performance by stabilizing the core and reducing resistance.
Implementation Method 1
a cooling plate in a cylindrical secondary battery... to confirm that it is possible to suppress generation of internal heat and to prevent occurrence of thermal runaway
Data Source
Figure 1
Figure 2
Figure 3
AI summary
The present invention relates to a cylindrical type secondary battery in which a center pin is inserted into a core of an electrode assembly and a cap assembly is coupled to an upper portion of a battery case so that the inserted center pin supports the electrode assembly in a radial direction on an inner circumferential surface of the core by elasticity, thereby preventing collapse of the core and increasing an adhesion force of positive and negative electrodes. The cylindrical type secondary battery according to the present invention includes a jelly-roll-type electrode assembly wound by interposing a separator between sheet-shaped positive and negative electrodes, a battery case in which the electrode assembly is accommodated, a cap assembly coupled to an upper portion of the battery case, and a center pin inserted into a core of the electrode assembly and configured to support the electrode assembly in a radial direction on an inner circumferential surface of the core by elasticity, wherein the center pin includes an elastic body having a length.