Cylindrical Battery Collector Board Venting Under Internal Pressure
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional cylindrical battery cells face challenges in easy gas discharge due to the collector board blocking the space between the central portion and the venting portion of the electrode assembly, leading to increased internal pressure and potential explosion.
Innovation Solution
A cylindrical battery cell design featuring a breaking induction portion on the collector board, such as a notched groove or twisted portion, that allows the collector board to deform and break under internal pressure, facilitating gas discharge through a venting mechanism.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a collector board is used to electrically connect the positive and negative electrode plates, then electrical connection is improved, but gas discharge is blocked and internal pressure increases
Solution Approach 1:
The collector board is segmented into a fixed portion and a movable portion that can be separated from each other. The movable portion is positioned to be separable from the electrode assembly, creating a passage for gas discharge while maintaining electrical connection through the fixed portion. This segmentation resolves the contradiction by allowing the collector board to both conduct electricity and permit gas escape.
Solution Approach 2:
The collector board incorporates a movable portion that can dynamically change its position relative to the electrode assembly. During normal operation, the movable portion maintains electrical connection. When internal pressure increases, the movable portion can shift or separate to allow gas discharge, thus adapting to different operational states and resolving the static contradiction between electrical connection and gas discharge.
2Stability of the object's composition
If the collector board is made rigid to ensure structural stability, then structural stability is improved, but gas discharge is prevented and explosion risk increases
Solution Approach 1:
The collector board is divided into fixed and movable portions, where the fixed portion provides structural stability and the movable portion provides pressure relief capability. This segmentation allows the system to simultaneously achieve structural stability and explosion prevention by distributing these functions to different segments.
Solution Approach 2:
Different portions of the collector board have different properties: the fixed portion is designed for structural stability and electrical connection, while the movable portion is designed to respond to pressure changes. This local differentiation of qualities allows the overall structure to be both stable and safe, resolving the contradiction between rigidity and pressure relief.
3Ease of operation
If a venting portion is formed in the battery can, then gas discharge path is provided, but the collector board blocks the space between central portion and venting portion
Solution Approach 1:
The collector board's segmentation into fixed and movable portions allows the movable portion to be positioned or removed to clear the space between the central portion and venting portion. This enables gas discharge through the venting portion while maintaining electrical connection through the fixed portion, resolving the spatial blocking issue.
Solution Approach 2:
The movable portion of the collector board can dynamically adjust its position to clear the path to the venting portion when pressure builds up, allowing gas discharge without permanent structural modification. This dynamic adjustment resolves the contradiction by temporarily modifying the collector board configuration only when needed.
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 design effectively reduces internal pressure and prevents explosions by allowing gas to escape, ensuring safety and stability of the battery cell.
Implementation Method 1
a breaking induction portion is formed on the positive electrode collector board or the negative electrode collector board so that at least a portion of the positive electrode collector board or the negative electrode collector board is broken by gas generated inside the battery can
Data Source
Figure 1
Figure 2
Figure 3
AI summary
Disclosed are a cylindrical battery cell, a battery pack and vehicle including the same, and a collector board. A cylindrical battery cell according to an embodiment of the present disclosure includes: an electrode assembly configured in a structure in which a positive electrode plate, a negative electrode plate, and a separator interposed between the positive electrode plate and the negative electrode plate are wound in one direction; a cylindrical battery can configured to store the electrode assembly and having a through-hole formed thereon; a positive electrode collector board electrically connected to the positive electrode plate; a cell terminal connected to the positive electrode collector board through the through-hole of the battery can; and a negative electrode collector board electrically connected to the negative electrode plate, wherein a breaking induction portion is formed on the positive electrode collector board or the negative electrode collector board so that at least a portion of the positive electrode collector board or the negative electrode collector board is broken by gas generated inside the battery can.