Battery Pack Venting Structure for Breathable Sheet Protection
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Solution Overview
Problem
The existing battery packs with breathable waterproof sheets for pressure regulation are prone to damage due to their need to allow air passage, and they struggle to efficiently discharge high-temperature gases during abnormal battery states without compromising the waterproof integrity.
Innovation Solution
A battery pack design featuring a breathable waterproof sheet covered by a protective design sheet with gas grooves that diffuse air and gas discharge, ensuring the sheet's protection and rapid gas release, while maintaining a waterproof structure through a larger design sheet covering the breathable sheet and an air layer guiding gases to the grooves.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a breathable waterproof sheet is used to close the gas discharge hole, then air can pass through to prevent internal pressure fluctuation, but the sheet is easily damaged due to its thin structure
Solution Approach 1:
A protective design sheet is pre-installed over the breathable waterproof sheet before any damage can occur. This design sheet acts as a preliminary protective layer that shields the thin breathable sheet from mechanical damage while allowing air to pass through to the gas discharge hole.
Solution Approach 2:
The design sheet provides beforehand cushioning protection to the breathable waterproof sheet. When external forces or debris might damage the thin breathable sheet, the design sheet absorbs and distributes these forces, preventing direct damage to the critical breathable layer.
2Strength
If the breathable waterproof sheet is made thicker to prevent damage, then durability improves, but air passage capability is reduced
Solution Approach 1:
The protective function is segmented into two distinct layers: a thin breathable waterproof sheet for air passage and a thick design sheet for protection. Each layer performs its specialized function without compromising the other - the thin sheet maintains air flow capability while the thick sheet provides durability.
Solution Approach 2:
Different parts of the sheet assembly have different thicknesses and properties optimized for their specific functions. The breathable waterproof sheet is thin at the gas discharge hole area to allow air passage, while the design sheet is thicker to provide protection, creating a composite structure with locally optimized properties.
3Reliability
If a sealing structure is used in the outer case, then waterproof structure is achieved, but internal pressure fluctuation due to temperature changes cannot be prevented
Solution Approach 1:
The breathable waterproof sheet acts as an intermediary element between the sealed outer case and the internal battery components. It allows the case to remain sealed for waterproofing while the breathable sheet mediates pressure changes by allowing air to pass through to the gas discharge hole, preventing pressure buildup.
4Productivity
If the breathable waterproof sheet is directly exposed, then gas discharge is possible, but the sheet is vulnerable to damage from high-temperature ejected gas
Solution Approach 1:
The design sheet is pre-positioned to cover the breathable waterproof sheet before high-temperature gas ejection occurs. This preliminary protective arrangement shields the breathable sheet from thermal and mechanical damage during abnormal battery events while still allowing gas to discharge through the system.
Solution Approach 2:
The design sheet provides beforehand cushioning protection against high-temperature ejected gas. When abnormal gas is discharged, the design sheet absorbs and distributes the thermal and mechanical energy, preventing direct damage to the breathable waterproof sheet while still allowing gas passage.
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 prevents damage to the breathable waterproof sheet, allows smooth discharge of high-temperature gases, and maintains internal pressure stability by diffusing air and gases through the grooves, ensuring rapid release and preventing sheet damage during temperature fluctuations and abnormal battery states.
Implementation Method 1
The breathable waterproof sheet allows air to pass therethrough and does not allow water to pass therethrough
Implementation Method 2
the gas groove is coupled to the discharge side of the breathable waterproof sheet... allows air to pass through the breathable waterproof sheet and diffuses the air passing through the breathable waterproof sheet with the gas groove to discharge the air to the outside
Data Source
Figure 1
Figure 2
Figure 3
AI summary
High-temperature ejected gas discharged from an incorporated battery is smoothly discharged to an outside while damage to a breathable waterproof sheet that closes a gas discharge hole of a case is prevented. In a battery pack, a battery core pack is housed in an outer case (1) where a gas discharge hole (3) is closed by a breathable waterproof sheet (4), a design sheet (5) is disposed to cover the breathable waterproof sheet (4), a gas groove (7) is provided between the breathable waterproof sheet (4) and the design sheet (5), and the gas groove (7) communicates with a discharge side of the breathable waterproof sheet (4).