Battery Case Vent Structure for Reliable Pressure Relief
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Solution Overview
Problem
As battery sizes and thicknesses increase to meet growing demand, existing explosion-proof valves formed via forge processing face challenges with excess plate metal and instability, leading to unreliable rupture under abnormal pressure conditions.
Innovation Solution
A battery case design featuring a continuous folded part, thin plate part, thick plate part, and breaking groove, where the thick plate part receives excess metal and stabilizes the explosion-proof valve's thickness and shape, ensuring reliable rupture when pressure abnormalities occur, with optional concave grooves for controlled pressure release.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the plate thickness of the battery case is increased to meet growing demand, then the battery case can accommodate larger batteries, but the area of the opening part in the explosion-proof valve must be enlarged to release internal gas more rapidly
Solution Approach 1:
The explosion-proof valve is segmented into multiple functional parts: a thin plate part for rapid rupture, a thick plate part for structural stability, and a folded part for pressure absorption. This segmentation allows the opening part to be sufficiently large for rapid gas release while the thick plate part maintains overall structural integrity of the battery case.
2Reliability
If the plate thickness of the explosion-proof valve is reduced to enable rapid rupture, then the valve can rupture more easily under abnormal pressure, but excess plate metal is left during forge processing
Solution Approach 1:
The explosion-proof valve has non-uniform thickness with a thin plate part (first thickness) for rapid rupture and a thick plate part (second thickness greater than the first) for receiving excess metal. This local quality variation allows the thin section to rupture reliably while the thick section absorbs excess material during forge processing, stabilizing the manufacturing process.
3Speed
If the plate thickness of the explosion-proof valve is reduced for rapid rupture, then the valve responds faster to pressure abnormalities, but the forge and mold processing becomes unstable
Solution Approach 1:
The thick plate part is positioned at the middle of the explosion-proof valve to receive excess plate metal during forge processing, stabilizing the manufacturing process. The thin plate part ensures rapid gas release when needed. This local quality differentiation resolves the contradiction between processing stability and rapid response.
Solution Approach 2:
The thick plate part is pre-formed to receive excess metal during forge processing, preventing processing instability before it occurs. This preliminary structural preparation ensures that subsequent forging operations produce consistent, reliable explosion-proof valves with proper thickness distribution.
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 manages increased battery case sizes and thicknesses by stabilizing the explosion-proof valve's structure and ensuring reliable pressure relief, reducing production complexity and costs while enhancing safety.
Implementation Method 1
When an explosion-proof valve is formed by forge processing, a plate thickness of the explosion-proof valve is needed to be reduced. However, this process raises a problem that reduction of the plate thickness leaves excess plate metal
Implementation Method 2
a breaking groove which is provided at the thin plate part and is configured to rupture when a predetermined pressure is exerted thereon
Data Source
AI summary
Provided is a battery case which preferably corresponds to increases in size and thickness of the battery case. The battery case is made of metal provided with an explosion-proof valve. The explosion-proof valve is continuous with a plate part configuring the battery case. The explosion-proof valve includes a folded part formed by folding the plate part, a thin plate part which is continuous with the folded part and arranged inside the folded part, a thick plate part which is continuous with the thin plate part and formed thicker than the thin plate part in the middle of the explosion-proof valve, and a breaking groove which is arranged in the thin plate part and configured to rupture when a predetermined pressure is exerted thereon.