Battery Cell Vent Guide Structure for Controlled Flame Discharge
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Solution Overview
Problem
Secondary batteries are prone to chain ignition and lack effective venting mechanisms, which can lead to uncontrolled discharge of gases and flames, posing safety risks.
Innovation Solution
A battery cell design featuring a vent member with a blocking member and a guide member that opens under pressure, ensuring controlled venting and preventing chain ignition by guiding the blocking member to an open position, using materials like silicone or polyurethane for the blocking member and a guide body with a specific structure to facilitate smooth discharge.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If a vent hole is provided in the battery cell to allow gas discharge, then venting performance is improved, but the risk of chain ignition between adjacent cells increases
Solution Approach 1:
A blocking member is introduced as an intermediary element in the vent hole. This blocking member can be in a blocked state during normal operation to prevent flame propagation to adjacent cells, and transitions to an open state when internal pressure exceeds a threshold, allowing controlled venting. The blocking member thus mediates between the conflicting requirements of preventing chain ignition and enabling venting performance.
2Object-affected harmful factors
If a blocking member is installed in the vent hole to prevent chain ignition, then safety is improved, but venting performance deteriorates due to potential blockage
Solution Approach 1:
The blocking member is designed with dynamic characteristics, transitioning between blocked and open states based on internal pressure conditions. During normal operation, the blocking member remains in a blocked state to prevent chain ignition. When internal pressure exceeds a predetermined threshold, the blocking member automatically opens to allow gas discharge, thus dynamically balancing safety and venting performance requirements.
3Object-generated harmful factors
If the vent member is designed to open easily for smooth venting, then venting performance is improved, but control over the opening pressure is reduced
Solution Approach 1:
The opening pressure of the vent member is precisely controlled by adjusting parameters such as the melting point or decomposition temperature of the holding member material, or by modifying the geometric dimensions of the holding member structure. These parameter changes enable the vent member to open smoothly when the threshold pressure is reached, while maintaining reliable control over the opening pressure point.
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 design effectively prevents or reduces the likelihood of chain ignition and ensures smooth venting performance, enhancing safety by controlling the discharge of gases and flames from individual cells.
Implementation Method 1
a vent member sealing the vent hole and configured and/or operable to be opened if (e.g., when) an internal pressure of the cell case increases to a pressure equal to or exceeding a set or threshold pressure
Data Source
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AI summary
A battery cell includes an electrode assembly, a cell case accommodating the electrode assembly and having a vent hole, a vent member sealing the vent hole and configured to be opened if an internal pressure of the cell case increases, a blocking member installed in the vent hole and covering the vent member, and a guide member installed in the vent hole and configured to guide the blocking member in opening if the vent member is opened.