Battery Cell Pressure Relief Venting Through a Protective Member
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Solution Overview
Problem
Existing battery cells face safety issues due to obstruction of the pressure relief mechanism by protective members, which can prevent timely pressure release when internal pressure or temperature thresholds are reached, leading to potential safety hazards.
Innovation Solution
A battery cell design featuring a pressure relief mechanism with an opening portion that destructs a protective member when internal pressure or temperature thresholds are met, including a pressure relief body with a first pressure relief groove and puncturing portions to ensure timely pressure release, enhancing the safety performance by reducing obstruction and improving controllability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a protective member is placed above the pressure relief mechanism, then the pressure relief mechanism is protected from external damage, but the protective member may obstruct the pressure relief mechanism from opening timely when internal pressure or temperature reaches threshold
Solution Approach 1:
The pressure relief mechanism is pre-configured with a puncturing portion that is positioned to automatically puncture the protective member when activated. This preliminary arrangement ensures that when the pressure or temperature threshold is reached, the puncturing portion can immediately penetrate the protective member without obstruction, allowing timely pressure release while maintaining the protective function during normal operation
Solution Approach 2:
The puncturing portion acts as an intermediary element between the pressure relief mechanism and the protective member. It serves as a dedicated component that bridges the protective function and the pressure relief function, enabling the mechanism to penetrate the protective member when needed while maintaining structural integrity during normal operation
2Ease of operation
If the pressure relief mechanism is designed to break along a first pressure relief groove, then the controllability of pressure relief is improved, but the structural complexity of the pressure relief mechanism increases
Solution Approach 1:
The pressure relief mechanism is segmented into distinct functional zones: a first pressure relief groove for controlled breaking, a second pressure relief groove for additional relief, and a puncturing portion for penetrating the protective member. This segmentation allows each component to perform its specific function efficiently, improving overall controllability while distributing the structural complexity across multiple simple, dedicated elements
Data Source
AI summary
A battery cell includes a pressure relief body, a pressure relief mechanism, and a protective member. The pressure relief mechanism is arranged on the pressure relief body. At least a part of the protective member is located on a side of the pressure relief mechanism away from an interior of the battery cell, and covers the pressure relief mechanism. The pressure relief mechanism includes an opening portion configured to, in response to an internal pressure or temperature of the battery cell reaching a threshold value, be opened and destruct the protective member to release the pressure when.