Battery Cell Cover Channel Structure for Pressure Relief Actuation
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Solution Overview
Problem
Existing battery cells face safety concerns due to the risk of explosion from thermal runaway, as gases accumulate between the cover assembly and electrode assembly, hindering timely release through pressure relief mechanisms.
Innovation Solution
A battery cell design featuring a casing with a pressure relief mechanism and a cover assembly having a recessed portion with channels to introduce gas into the space between the electrode assembly and casing, facilitating timely release of high-temperature and high-pressure substances through the pressure relief mechanism.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If gas accumulates between the cover assembly and electrode assembly, then the pressure relief mechanism cannot be actuated timely, but adding channels increases device complexity
Solution Approach 1:
The cover assembly is segmented into multiple functional regions: a first recessed portion for accommodating the tab portion, a second recessed portion for gas accumulation, and multiple first channels for gas flow. This segmentation allows gas to be directed through specific pathways to the pressure relief mechanism, ensuring timely actuation while maintaining structural organization.
Solution Approach 2:
The first channels act as intermediary pathways that connect the space between the electrode assembly and casing with the first recessed portion. These channels mediate the gas flow, introducing gas into the first recessed portion where it can act on the pressure relief mechanism, thereby enabling timely pressure relief without requiring direct communication between all components.
2Strength
If the cover assembly is made rigid to protect the battery cell, then gas pressure cannot be effectively released, but making it flexible reduces protective capability
Solution Approach 1:
The cover assembly exhibits local quality variations through its recessed portions and channel structures. The first recessed portion provides a localized space for gas accumulation and pressure actuation, while the surrounding structure maintains overall strength. This localized design allows specific areas to be more compliant for pressure relief while other areas maintain structural integrity.
Solution Approach 2:
The cover assembly incorporates dynamic characteristics through its recessed portions that can deform under pressure. The first recessed portion is designed to accommodate gas pressure and transmit it to the pressure relief mechanism, allowing the structure to dynamically respond to internal pressure changes while maintaining overall structural strength.
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
This design effectively reduces the risk of explosion by rapidly releasing gases and improving safety performance by ensuring timely actuation of the pressure relief mechanism, thereby enhancing the safety and stability of battery cells.
Implementation Method 1
the cover assembly is provided with at least one first channel for communicating the space between the electrode assembly and the casing with the first recessed portion, so as to introduce the gas in the first recessed portion into the space between the electrode assembly and the casing
Implementation Method 2
a casing having an opening and provided with a pressure relief mechanism which is actuated to relieve an internal pressure or temperature of the battery cell when the internal pressure or temperature reaches a threshold value
Data Source
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AI summary
The application provides a battery cell, a manufacturing method and a manufacturing system therefor, a battery and an electric device. The battery cell in one embodiment of the application includes a casing having an opening and provided with a pressure relief mechanism which is actuated to relieve an internal pressure or temperature of the battery cell when the internal pressure or temperature reaches a threshold value; an electrode assembly accommodated in the casing, and including a body portion and a tab portion protruding therefrom; and a cover assembly for covering the opening. A first recessed portion is formed on one side, abutting against the body portion and facing the electrode assembly, of the cover assembly, and is configured to accommodate at least part of the tab portion. The cover assembly is provided with at least one first channel for communicating the space between the electrode assembly and the casing with the first recessed portion, so as to introduce the gas in the first recessed portion into the space between the electrode assembly and the casing and enable the same to act on the pressure relief mechanism. The first channel can reduce the gas accumulated between the electrode assembly and the cover assembly, thereby reducing the safety risk.