Battery Cell Cover Plate Venting With a Thinned Insulating Layer
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Solution Overview
Problem
Current battery cells face safety concerns due to inadequate pressure relief mechanisms, where the explosion-proof valve may fail to open in time, leading to potential explosions.
Innovation Solution
A cover plate assembly with an insulating plate featuring a thinned region that overlaps the explosion-proof valve, allowing for increased exhaust area and timely opening, ensuring the valve opens to release pressure effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the explosion-proof valve is provided on the top cover plate, then the pressure relief function is improved, but the valve may fail to open in time due to insufficient exhaust area
Solution Approach 1:
The insulating plate is segmented into different thickness regions: a base portion with original thickness and a thinned region with reduced thickness. This segmentation allows the thinned region to serve as an additional exhaust path, increasing the effective exhaust area while maintaining the explosion-proof valve's pressure relief function.
Solution Approach 2:
The solution transitions from a two-dimensional exhaust area (valve opening) to a three-dimensional exhaust path by creating a thinned region that extends through the insulating plate thickness. This dimensional change provides an additional exhaust dimension, significantly increasing the effective exhaust area and improving pressure relief capability.
2Reliability
If the insulating plate is made thicker for insulation, then the insulation performance is improved, but the pressure relief speed is reduced
Solution Approach 1:
The insulating plate exhibits non-uniform thickness with different local qualities: the base portion maintains original thickness for insulation, while the thinned region has reduced thickness to facilitate rapid gas discharge. This local quality variation allows simultaneous optimization of insulation performance and pressure relief speed in different regions of the same component.
Solution Approach 2:
The thickness parameter of the insulating plate is changed locally in the thinned region, transitioning from the base thickness to a reduced thickness. This parameter change enables the thinned region to provide a low-resistance exhaust path for rapid pressure relief while the base portion maintains adequate insulation performance.
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 enhances the safety performance of battery cells by ensuring the explosion-proof valve opens promptly, preventing explosions and improving pressure relief efficiency.
Implementation Method 1
When pressure inside the housing reaches a pressure threshold, the explosion-proof valve is pushed open to release the pressure
Data Source
AI summary
A cover plate assembly, a battery cell, a battery module, a battery pack and an apparatus are disclosed. The cover plate assembly includes a top cover plate, where the top cover plate is provided with an explosion-proof valve; and an insulating plate, laminated with the top cover plate, where the insulating plate includes a base portion and a thinned region located on the base portion, the thinned region is formed by thinning the base portion, and a region enclosed by boundaries of an orthographic projection of the thinned region at least partially overlaps an orthographic projection of the explosion-proof valve in a thickness direction of the cover plate assembly. The thinned region is formed by thinning the base portion.