Battery Pack Vent Plate Structure for Cover Gas Impact Mitigation
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Solution Overview
Problem
In battery packs, high-pressure gas released during battery abnormalities can damage the cover by directly hitting it, and the plate-shaped reinforcing portion may experience excessive load, posing a risk to the fixation portion.
Innovation Solution
A battery pack design featuring a plate member with a main portion and fixation portion, where the main portion is between the battery cell's top surface and the cover, equipped with through holes to reduce pressure and a duct for gas discharge, and optionally with a deformation portion for elastic deformation to mitigate load application.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a plate-shaped reinforcing portion is disposed in the height direction of the secondary battery to reinforce the housing, then the housing strength is improved, but an excessive load is applied to the fixation portion due to high-pressure gas being received
Solution Approach 1:
The plate member is divided into a main portion and a fixation portion, with the main portion receiving gas pressure and the fixation portion providing structural support. This segmentation allows the plate to function as both a protective barrier and a structural reinforcement without overloading the fixation area.
Solution Approach 2:
The plate member has different functional zones: the main portion faces the battery cell to receive gas pressure, while the fixation portion is optimized for structural support and mounting. This local differentiation of properties allows each zone to perform its specific function optimally without compromising the other.
2Strength
If a plate-shaped reinforcing portion is disposed in the height direction of the secondary battery to reinforce the housing, then the housing strength is improved, but the gas directly hits the cover causing damage
Solution Approach 1:
The plate member acts as an intermediary component positioned between the battery cell and the cover. It intercepts the high-pressure gas before it can reach the cover, redirecting the gas flow while maintaining structural integrity. This mediator function protects the cover from direct gas impact.
3Stress or pressure
If the main portion of the plate member is provided with through holes, then pressure received by the plate member is reduced, but the device complexity increases
Solution Approach 1:
The main portion of the plate member incorporates through holes, transforming it from a solid barrier into a porous structure. This allows gas to pass through while reducing the pressure buildup on the plate, maintaining protective function with reduced stress concentration.
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 suppresses gas from hitting the cover, reduces pressure on the fixation portion, and secures the battery pack by allowing controlled gas discharge, preventing damage and excessive load application.
Implementation Method 1
a gas-release valve that releases gas from inside of the exterior package to the space through the top surface when pressure in the exterior package becomes equal to or more than a predetermined value
Implementation Method 2
the main portion being provided with a plurality of through holes, the plate member being composed of a metal or ceramic
Implementation Method 3
the plate member further has a deformation portion provided between the main portion and the fixation portion, the deformation portion being elastically deformable
Data Source
AI summary
A battery pack includes: a case main body provided with an opening; and a cover that is attached to the case main body so as to close the opening and that forms, together with the case main body, a space for accommodating a plurality of battery cells. Each of the battery cells has: an exterior package that includes a top surface facing the cover; and a gas-release valve that releases gas from inside of the exterior package to the space through the top surface. The battery pack further includes a plate member that has a main portion and a fixation portion, the main portion being disposed between the top surface and the cover in the space, the fixation portion extending from the main portion, the fixation portion being fixed, the main portion being provided with a plurality of through holes, the plate member being composed of a metal or ceramic.