Cylindrical Cell Battery Pack Venting for Induced Explosion Suppression
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Solution Overview
Problem
Existing battery pack designs with embedded members to prevent induced explosions due to abnormal heat generation in cylindrical cells are ineffective as the heat absorbing agents delay the melting of the container, leading to delayed opening and potential explosion.
Innovation Solution
A battery pack design with an embedded member featuring a container with a projecting portion between cylindrical cells, containing a heat absorbing agent and gas, where the gas accommodation portion melts early, accelerating the supply of the heat absorbing agent to prevent induced explosions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a container with heat absorbing agent is arranged between cylindrical cells, then induced explosion is suppressed, but the container melting is delayed and heat absorbing agent supply is slow
Solution Approach 1:
The container is divided into two distinct portions: a heat absorbing agent accommodation portion with thicker walls for structural integrity, and a gas accommodation portion with thinner walls for rapid melting. This segmentation allows each portion to serve its specific function optimally - the gas portion melts quickly to enable timely heat absorbing agent supply, while the heat absorbing agent portion maintains structural strength.
Solution Approach 2:
Different wall thicknesses are applied to different portions of the container based on local functional requirements. The gas accommodation portion has thinner walls to facilitate early melting and quick opening, while the heat absorbing agent accommodation portion has thicker walls to maintain structural integrity and contain the heat absorbing agent until needed.
2Speed
If the container wall is made thin for early opening, then response speed improves, but structural strength decreases
Solution Approach 1:
The container wall thickness is segmented into two zones: a thinner-walled gas accommodation portion for rapid melting and opening, and a thicker-walled heat absorbing agent accommodation portion for maintaining structural strength. This resolves the contradiction by applying different wall thicknesses to different functional zones of the same container.
Solution Approach 2:
The container exhibits non-uniform wall thickness with local quality variations - the gas portion has locally reduced wall thickness to enable fast melting, while the heat absorbing agent portion has locally increased wall thickness for structural support and containment.
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 early melting of the gas accommodation portion in the embedded member's container allows for accelerated supply of the heat absorbing agent, effectively suppressing induced explosions in adjacent cylindrical cells.
Implementation Method 1
the heat absorbing agent accommodated inside absorbs heat transmitted from a cylindrical cell to the container
Implementation Method 2
The gas accommodation portion is arranged at a tip portion of the projecting portion and is in contact with each of two adjacent ones of the cylindrical cells. According to the battery pack of the present disclosure, in an embodiment, the gas accommodation portion melts early
Data Source
AI summary
A battery pack is provided and includes a plurality of cylindrical cells arranged in a manner that electrode terminals face the same direction, and an embedded member arranged between a plurality of the cylindrical cells. The embedded member includes a container, and a heat absorbing agent and gas accommodated in the container. The container is provided with a projecting portion arranged between two adjacent ones of the cylindrical cells and extending in a longitudinal direction of the cylindrical cell as viewed from a longitudinal direction of the cylindrical cell. The projecting portion includes a heat absorbing agent accommodation portion in which a heat absorbing agent is accommodated and a gas accommodation portion in which gas is accommodated. The gas accommodation portion is arranged at a tip portion of the projecting portion and is in contact with each of two adjacent ones of the cylindrical cells.