Battery Cell Insulating Boss Venting for Pressure Relief Safety
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Solution Overview
Problem
Existing battery cell designs face safety issues due to pressure changes causing electrode assembly deformation, which can interfere with the pressure relief mechanism, potentially leading to compromised safety performance.
Innovation Solution
Incorporating an insulating part with a boss and through holes to separate the end cap and electrode assembly, creating an exhaust path for pressure relief and preventing electrode assembly contact with the pressure relief mechanism, thus ensuring normal operation and enhanced safety performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the electrode assembly is allowed to deform under pressure changes, then the battery cell can accommodate pressure variations, but the deformed electrode assembly may contact and interfere with the pressure relief mechanism, compromising safety
Solution Approach 1:
The battery cell internal space is segmented into distinct regions: an electrode assembly accommodating region, an insulating part region, and a pressure relief mechanism region. The insulating part acts as a physical barrier that prevents the deformed electrode assembly from contacting the pressure relief mechanism, allowing the electrode assembly to deform without compromising safety mechanism reliability
Solution Approach 2:
The insulating part serves as an intermediary element between the electrode assembly and the pressure relief mechanism. This intermediate structure absorbs the deformation of the electrode assembly under pressure changes while maintaining a safe distance from the pressure relief mechanism, thus resolving the conflict between adaptability and reliability
2Reliability
If the insulating part is designed with through holes to form exhaust paths, then pressure relief function is ensured, but the structural complexity of the insulating part increases
Solution Approach 1:
The insulating part is designed to perform multiple functions simultaneously: it provides electrical insulation between the electrode assembly and end cap, creates physical separation to prevent contact, and forms exhaust paths through integrated through holes to enable pressure relief. This multi-functionality reduces the need for additional separate components, thereby managing structural complexity while ensuring reliability
3Reliability
If the boss extends towards the electrode assembly to block contact, then safety is improved, but the available space for electrode assembly may be reduced
Solution Approach 1:
The insulating part features a boss structure with locally optimized geometry that extends towards the electrode assembly only in the critical region where contact prevention is needed. The through holes are strategically positioned to maintain exhaust functionality while minimizing space occupation. This localized design approach ensures safety without significantly reducing the overall volume available for the electrode assembly
Data Source
AI summary
A battery cell, a battery, and a method and a device for preparing the battery are provided. The battery cell includes: a housing, having an opening; an electrode assembly, accommodated in the housing; an end cap covering the opening and provided with a pressure relief mechanism; and an insulating member, disposed between the end cover and the electrode assembly to insulate and isolate the end cover from the electrode assembly. The insulating member includes a body and a boss, a first through hole being formed in the area of the body corresponding to the pressure relief mechanism, the boss being connected to the body and extending towards the electrode assembly, a second through hole being formed in a side surface of the boss. The first through hole and the second through hole are used for forming an exhaust channel from the interior of the battery cell to the pressure relief mechanism.