Pouch Battery Module Venting Structure for Reliable Pressure Release
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Solution Overview
Problem
Existing battery modules fail to effectively reduce inner pressure in pouch battery cells when they expand due to overheating, as holes in the exterior member can become closed by cutting blades or clogging occurs at through-holes, preventing sufficient pressure release.
Innovation Solution
A battery module design featuring an explosion-proof member with protruding portions that break through the exterior member to create air passages, ensuring gas discharge without blocking, and incorporating multiple air passages to facilitate efficient pressure reduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a cutting blade is used to tear the container, then the container can be opened, but the hole may be closed by the cutting blade itself, preventing pressure reduction
Solution Approach 1:
The patent introduces a separate protrusion structure that acts as an intermediary element to create the opening, distinct from the cutting blade. The protrusion pushes against the container to form an opening, while the cutting blade separately cuts the container. This separation ensures the opening-creating element does not block the opening it creates, resolving the contradiction between ease of operation and reliability of pressure reduction.
2Reliability
If a through-hole is provided in the case, then pressure can be released, but cut pieces may cause clogging in the through-hole, preventing sufficient pressure reduction
Solution Approach 1:
The patent introduces a guide member as an intermediary element between the cutting blade and the through-hole. The guide member guides the cut pieces away from the through-hole, preventing clogging. This allows the through-hole to effectively release pressure without being blocked by debris generated during the cutting process.
3Device complexity
If the through-hole is made at the distal end of the protrusion, then the structure is simple, but the distal end becomes easily deformed and difficult to break through the exterior laminate
Solution Approach 1:
The patent extracts the through-hole formation function from the protrusion structure. Instead of forming the through-hole at the distal end of the protrusion, the through-hole is formed separately in the case. The protrusion's sole function is to push and create the opening in the container, while the through-hole serves as the pressure release path. This separation prevents deformation of the protrusion tip while maintaining structural simplicity.
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 ensures high certainty in reducing inner pressure by preventing closure of discharge openings and maintaining effective gas release, enhancing safety and reliability of the battery module.
Implementation Method 1
a protruding portion that is provided to protrude from the plate portion to break through the exterior member when the pouch battery cell is expanded
Implementation Method 2
A first air passage configured to cause a gas discharged from an opening formed in the exterior member by the protruding portion to flow is provided in the explosion-proof member
Data Source
AI summary
A battery module includes: a pouch battery cell including a battery portion and an exterior member that covers the battery portion; and an explosion-proof member. The explosion-proof member includes: a plate portion facing the pouch battery cell; and a protruding portion that is provided to protrude from the plate portion to break through the exterior member when the pouch battery cell is expanded. In the explosion-proof member, a first air passage through which a gas discharged from an opening formed in the exterior member by the protruding portion flows is provided in a part of the protruding portion excluding a distal end.