Cylindrical Battery Can Thin Wall Gas Venting
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Solution Overview
Problem
To enhance the safety of batteries by improving the gas release mechanism while maintaining high energy density, as existing safety valves may become insufficient with smaller pore portions for higher capacity batteries.
Innovation Solution
A battery design featuring a cylindrical can with a thin wall part on its circumferential surface, where the ratio of the average hole diameter to the outer diameter is 17% or less, and the thin wall part is strategically positioned between 0% to 30% and 70% to 100% from the end, facilitating efficient gas discharge without compromising the battery's structural integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the pore portions of the power generation element are made small to increase battery capacity, then the energy density is improved, but the gas guide function becomes insufficient
Solution Approach 1:
The patent introduces a thin wall part as an intermediary structure between the power generation element and the external environment. This thin wall part serves as a dedicated gas guide path that is independent of the pore portions, allowing gas to be guided to the safety valve without relying on the pore portions' dimensions. The thin wall part acts as a mediator that resolves the conflict between maintaining small pore portions for high capacity and ensuring adequate gas guidance function.
2Productivity
If the thin wall part is made thinner to improve gas discharge efficiency, then the gas release function is improved, but the structural integrity deteriorates
Solution Approach 1:
The patent applies local quality by creating a thin wall part with reduced thickness only in specific regions where gas discharge is needed, while maintaining normal wall thickness in other areas to preserve overall structural integrity. The thin wall part is positioned at predetermined locations on the circumferential surface, allowing localized optimization for gas discharge without compromising the global strength of the battery can.
Solution Approach 2:
The battery can's circumferential surface is segmented into different regions with different wall thicknesses. The thin wall part represents a segmented portion specifically designed for gas discharge, separated from the main structural body. This segmentation allows the gas discharge function to be optimized independently from the structural integrity requirements of the overall can.
3Ease of manufacture
If the thin wall part is positioned at the center of the circumferential surface, then the manufacturing is simplified, but the gas discharge efficiency decreases
Solution Approach 1:
The patent optimizes the positional arrangement of thin wall parts along the circumferential direction of the battery can. By strategically positioning multiple thin wall parts at specific angular intervals around the circumferential surface, the gas discharge efficiency is enhanced through improved gas flow distribution, while the positioning in the axial direction remains simplified for manufacturing. This multi-dimensional positioning strategy resolves the contradiction between manufacturing ease and discharge efficiency.
Data Source
AI summary
A battery is provided. The battery includes a power generation element having a through hole; and a cylindrical can housing the power generation element and having at least one thin wall part on a circumferential surface of the cylindrical can. A ratio of a hole diameter of the through hole to an outer diameter of the power generation element is 17% or less. The thin wall part is provided in one or both of regions in a range from 0% to 30% and a range from 70% to 100% from one end of the circumferential surface.