Battery Cell Insulation Layout for Unblocked Pressure Relief
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Solution Overview
Problem
Existing battery cells face issues with timely pressure relief during thermal runaway, leading to reduced reliability due to overlapping insulating regions obstructing pressure relief mechanisms.
Innovation Solution
The design of a battery cell with a first insulating member that does not overlap with the pressure relief mechanism, allowing for improved timeliness of pressure relief and enhanced insulation performance by positioning the overlapping region away from the pressure relief mechanism, thereby reducing interference and increasing the service life of the mechanism.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the first insulating member wraps the outer surface of the casing with overlapping regions, then the insulation performance is improved, but the pressure relief mechanism may be blocked causing delayed pressure release
Solution Approach 1:
The first insulating member is designed with different properties in different regions: the first overlapping region provides enhanced insulation without blocking the pressure relief mechanism, while the second overlapping region provides insulation in areas less critical for pressure relief. This local differentiation allows the insulating member to provide comprehensive insulation while maintaining pressure relief functionality.
Solution Approach 2:
The insulating member is divided into multiple overlapping regions (first overlapping region and second overlapping region) with different functions. The first overlapping region is positioned to avoid blocking the pressure relief mechanism, while the second overlapping region provides additional insulation in other areas, achieving both insulation performance and pressure relief timeliness.
2Reliability
If the first overlapping region is positioned on the second wall part away from the pressure relief mechanism, then the pressure relief timeliness is improved, but the insulation coverage may be reduced
Solution Approach 1:
The insulating member provides insulation coverage through multiple dimensions and regions. By positioning the first overlapping region on the second wall part and adding a second overlapping region, the insulating member achieves comprehensive insulation coverage while maintaining pressure relief timeliness through strategic positioning in different spatial regions.
Solution Approach 2:
Different overlapping regions are positioned in different locations on the casing to provide localized insulation where needed while avoiding interference with the pressure relief mechanism. The first overlapping region on the second wall part and the second overlapping region work together to provide comprehensive insulation without compromising pressure relief functionality.
Data Source
AI summary
A battery cell, a battery, and an electric device are described. The battery cell includes a casing and a first insulating member. The casing is provided with a pressure relief mechanism. The first insulating member wraps the outer surface of the casing, the first insulating member has a first overlapping region, and the first overlapping region does not overlap with the pressure relief mechanism. In this way, the first overlapping region of the first insulating member does not block the pressure relief mechanism, reducing the risk of the pressure relief mechanism failing to release pressure in time due to that the first overlapping region of the first insulating member blocks the pressure relief mechanism, thereby improving the timeliness of pressure relief of the pressure relief mechanism and improving the reliability of the battery cell.