Battery Cell Bracket Exhaust Channels for Thermal Runaway Venting
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Solution Overview
Problem
The reliability of battery cells is hindered by slow gas exhaustion rates during thermal runaway, leading to a higher risk of burning and explosion, which affects the stability and reliability of batteries.
Innovation Solution
A bracket with specific design features, including abutting portions and gas passage gaps, forms exhaust and flow guide channels that enhance gas discharge and electrolyte solution infiltration, reducing the risk of explosion and improving stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the battery cell uses a conventional bracket design without abutting portions, then the structure is simpler, but the gas exhaustion capability is slow, leading to higher risk of burning and explosion
Solution Approach 1:
The bracket is segmented into multiple functional portions: a bracket body, a first abutting portion that abuts the electrode assembly to form a first exhaust channel, and a second abutting portion that abuts the housing to form a second exhaust channel. This segmentation creates multiple gas discharge pathways, improving gas exhaustion capability and reducing explosion risk while maintaining reasonable structural complexity.
Solution Approach 2:
The bracket serves multiple functions simultaneously: it provides structural support, creates first and second exhaust channels for gas discharge, and forms abutting relationships with both the electrode assembly and housing. This multi-functionality improves safety without requiring additional separate components, thus not significantly increasing device complexity.
2Reliability
If the bracket creates longer exhaust channels by increasing distance between components, then gas exhaustion capability is improved, but the structural space requirement increases
Solution Approach 1:
The exhaust channels are formed by utilizing the thickness dimension of the bracket body. The first abutting portion protrudes in the thickness direction to create the first exhaust channel, while the second abutting portion creates the second exhaust channel. This dimensional approach allows long exhaust pathways within a compact bracket volume, improving gas exhaustion capability without significantly increasing overall bracket volume.
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 enhanced exhaust and infiltration capabilities reduce the risk of battery cell explosions and improve reliability by ensuring timely pressure relief and efficient electrolyte distribution.
Implementation Method 1
When thermal runaway tends to occur in the battery cell, generated gas may first enter the first exhaust channel, then pass through the bracket through the exhaust hole, and finally may be discharged from the explosion-proof valve, to implement rapid pressure relief
Implementation Method 2
during injection, an electrolyte solution may flow to the electrode assembly through the gas passage gap, to shorten infiltration time and improve infiltration efficiency
Data Source
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AI summary
The present application discloses a battery cell, a battery, a power consuming apparatus, and a bracket. The battery cell includes: a housing, provided with an explosion-proof valve; an electrode assembly, arranged in the housing; and a bracket, including a bracket body and a first abutting portion. The bracket body has a first side and a second side that are arranged opposite to each other, an exhaust hole is provided on the bracket body, and the exhaust hole is configured to be opposite to the explosion-proof valve. The first abutting portion is arranged on the first side and is configured to abut against an end portion of the electrode assembly, so that the exhaust hole and the end portion of the electrode assembly jointly form a first exhaust channel. In the technical solutions of the embodiments of the present application, an exhaustion capability is improved, a risk that a battery cell burns and explodes is reduced, and an impact on an adjacent battery cell is reduced, thereby helping improve use reliability and stability of a battery.