Sealed Battery Current Collecting Plate Heat Dissipation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional sealed secondary batteries with current interrupt mechanisms face issues with overheating and fusion during high-rate charge and discharge, leading to unreliable current interruption.
Innovation Solution
A current collecting plate with a central thin section and a thick portion, featuring an annular groove for breaking, is designed to dissipate Joule heat efficiently, ensuring reliable current interruption at predetermined internal pressures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the current collecting plate is made with a thin section or groove to enable rapid breaking at predetermined pressure, then current interruption reliability is improved, but the portion generates excessive Joule heat during high-rate charge/discharge causing fusion
Solution Approach 1:
The current collecting plate is designed with a thin section that has a specific thickness gradient, creating different mechanical properties in different zones. The thin section is thin enough to break at predetermined pressure but maintains sufficient cross-sectional area to dissipate Joule heat, resolving the contradiction between breakability and heat resistance.
Solution Approach 2:
The invention optimizes the thickness parameter of the thin section within a specific range (0.03mm to 0.15mm). This parameter change ensures that the section is thin enough to break reliably at the predetermined internal pressure while maintaining sufficient thermal mass to prevent fusion during high-rate charge and discharge operations.
2Reliability
If the current collecting plate is made thinner to facilitate breaking, then current interruption is achieved more reliably, but the heat resistance and fusion resistance are reduced
Solution Approach 1:
The current collecting plate features a localized thin section with controlled thickness, while other portions maintain normal thickness. This local quality differentiation allows the thin section to break reliably under pressure while the thicker portions provide structural support and heat dissipation capability.
Solution Approach 2:
The thin section is pre-formed with a specific thickness profile before the battery operates. This preliminary structural preparation ensures that when internal pressure reaches the predetermined level, the thin section will break reliably, while its optimized dimensions prevent fusion under normal high-rate charge/discharge conditions.
3Power
If high-rate charge and discharge are implemented for large capacity batteries, then power output is improved, but Joule heat generation increases causing potential fusion
Solution Approach 1:
The invention extracts the current interrupt function from the main body of the current collecting plate by creating a separate thin section. This extracted thin section serves as a dedicated safety mechanism that breaks under abnormal pressure conditions, while the main body maintains sufficient thickness to handle high-rate charge/discharge currents without excessive heat generation.
Solution Approach 2:
The current collecting plate is segmented into different thickness zones: a thin section for pressure-sensitive breaking and thicker portions for current conduction and heat dissipation. This segmentation allows the battery to achieve high power output while maintaining safety through the thin section's pressure-responsive breaking capability.
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 solution effectively prevents fusion and ensures accurate current interruption during high-rate charge and discharge, enhancing the reliability of the current interrupt mechanism and heat resistance.
Implementation Method 1
this portion generates heat due to the generated Joule heat and when the generation of heat becomes excessive, the corresponding zone can be fused due to the overheating
Implementation Method 2
When the internal pressure of the case (gas pressure) rises, the inversion plate is inverted and deformed by the gas pressure in the direction of separating from the electrode body and current collecting plate
Data Source
AI summary
Provided is a sealed secondary battery having a current interrupt mechanism with a high heat resistance that prevents fusion of the current collecting plate by the Joule heat generated during high-rate charge and discharged. A current interrupt mechanism 80 of a sealed secondary battery 10 provided in accordance with the present invention is configured such that when the internal pressure inside a battery case 12 rises above the predetermined level, a current interrupt valve 30 is deformed by the internal pressure in a direction of separating from a rectangular plate-shaped current collecting plate 72 and the current collecting plate breaks in the portion of an annular groove 79 of a central thin section 74 of the current collecting plate.