Battery Cell End Cover Insulation Structure for Higher Yield
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Solution Overview
Problem
The challenge in battery manufacturing is the low yield and high production difficulty due to deformation and damage of insulating members in the end cover, which affects the reliability and energy density of battery cells.
Innovation Solution
The end cover design includes a first and second insulating member fixedly connected to the cover body, with large and thin structures to reduce deformation, and snap-fit connections for easy assembly and disassembly, enhancing the energy density and production efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If insulating members are made thicker to reduce deformation, then reliability improves, but volume occupied increases reducing energy density
Solution Approach 1:
The patent changes the geometric parameters of the insulating members by introducing suspension sections with specific length-to-thickness ratios (40-2100), transforming the structure from solid blocks to optimized profiles that maintain reliability while minimizing volume
Solution Approach 2:
The insulating members are segmented into fixed portions and suspension sections, allowing different parts to serve different functions - the fixed portions provide structural support while the suspension sections minimize material usage and reduce overall volume
2Reliability
If insulating members are made larger to improve insulation performance, then reliability improves, but volume occupied increases reducing energy density
Solution Approach 1:
The patent optimizes the dimensional parameters of insulating members by controlling the ratio of suspension section length to thickness (40-2100), achieving optimal insulation performance with minimized volume
Solution Approach 2:
The insulating members are designed with thin suspension sections that provide sufficient insulation performance while occupying minimal space, effectively using thin-film principles to reduce volume
3Reliability
If insulating members are rigidly fixed to prevent deformation, then reliability improves, but manufacturing complexity increases
Solution Approach 1:
The insulating members are divided into fixed portions (rigidly connected to cover body) and suspension sections (flexible connection), creating a segmented structure that provides stability where needed while simplifying manufacturing
4Volume of moving object
If insulating members are made thinner to reduce volume, then energy density improves, but deformation increases reducing reliability
Solution Approach 1:
The patent carefully controls the thickness parameter of suspension sections within specific ratios (40-2100 relative to length), optimizing the balance between minimizing volume and maintaining sufficient mechanical strength
Solution Approach 2:
By segmenting the insulating members into thin suspension sections and fixed portions, the design achieves minimal volume occupation while the fixed portions provide structural support that prevents excessive deformation
Data Source
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AI summary
The present application discloses an end cover, a battery cell, a battery, and an electric device. The end cover comprises: a cover body, a first insulating member, and a second insulating member. The first insulating member is fixedly connected to the cover body, and one end of the first insulating member forms a first connecting end; the second insulating member is fixedly connected to the cover body, and one end of the second insulating member forms a second connecting end; and the first connecting end and the second connecting end are oppositely arranged and fixedly connected. The end cover provided by the present application improves the yield rate and the production efficiency of battery cells.