Secondary Battery Insulating Plate for Venting and Strength Balance
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Solution Overview
Problem
In secondary batteries with discharge valves, insulating plates face a challenge in maintaining sufficient strength while ensuring high capacity and smooth gas discharge, as thin plates with large holes can deform or break, clogging the valve and inhibiting discharge.
Innovation Solution
An insulating plate with a thickness of 0.1 mm or more, a central hole, and at least one peripheral hole, maintaining a thickness-to-diameter ratio of 0.016 or less and an opening ratio of 36% or less, is used to balance strength and discharge efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the thickness of the insulating plate is reduced to ensure high capacity, then the battery capacity is improved, but the strength of the insulating plate deteriorates
Solution Approach 1:
The patent optimizes the thickness-to-diameter ratio parameter to 0.016 or less, and controls the opening ratio at 36% or less, achieving a balance between capacity and strength through precise parameter control rather than simply increasing thickness
Solution Approach 2:
The insulating plate features non-uniform hole distribution with different hole sizes and positions, creating local variations in structure that optimize both gas discharge performance and overall strength while maintaining thin thickness
2Quantity of substance
If the insulating plate is made large to match the battery outer diameter, then the battery capacity is improved, but the strength of the insulating plate deteriorates
Solution Approach 1:
The patent introduces the thickness-to-diameter ratio as a controlling parameter (0.016 or less), allowing large diameter plates to maintain sufficient strength by adjusting the thickness parameter proportionally
Solution Approach 2:
The strategic placement of holes and their varying sizes create local structural optimizations that distribute stress appropriately across the large plate area, preventing overall strength deterioration
3Reliability
If the insulating plate is provided with holes for lead passage and gas flow, then the discharge valve functionality is improved, but the strength of the insulating plate deteriorates
Solution Approach 1:
The patent controls the opening ratio at 36% or less and optimizes hole distribution, ensuring sufficient gas flow paths while maintaining adequate plate strength to prevent breakage
Solution Approach 2:
Different regions of the insulating plate have different hole configurations - the central hole for lead passage and peripheral holes for gas flow - optimizing local functions while maintaining overall structural integrity
Data Source
AI summary
An insulating plate for a secondary battery includes a wound electrode group, an electrolyte, a cylindrical battery case that houses the electrode group and the electrolyte, and a sealing body that seals an opening of the battery case and includes a discharge valve. The insulating plate is disposed between the electrode group and the sealing body and has a disk shape with a thickness T of 0.1 mm or more. The insulating plate has a first hole formed centrally therein and at least one second hole formed around the first hole so as to extend along the outer periphery of the disk shape. The ratio (=T/D) of the thickness T to a diameter D of the insulating plate is 0.016 or less, and the insulating plate has an opening ratio of 36% or less.