Dual-Valve Battery Pack Drain Assembly for Liquid Ingress Control
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Solution Overview
Problem
Existing vehicle battery pack drain assemblies lack efficiency and effectiveness in managing liquid drainage, particularly in preventing liquid ingress and reducing the frequency of primary drain valve opening.
Innovation Solution
The battery pack drain assembly incorporates a dual-valve system, featuring a primary drain valve within the inner wall that opens when liquid reaches the upper portion and a secondary check valve on the outer wall that allows water vapor to pass while preventing liquid, thereby reducing the frequency of primary valve opening and preventing liquid ingress.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a primary drain valve is used to drain liquid from the battery pack, then liquid drainage is achieved, but the frequency of valve opening increases during intermittent liquid events, reducing system efficiency
Solution Approach 1:
The drain assembly is segmented into two functional valves: a primary drain valve for efficient liquid drainage and a secondary check valve for preventing liquid ingress. This segmentation allows the primary valve to open less frequently while the secondary valve handles intermittent liquid events, resolving the contradiction between drainage efficiency and valve opening frequency.
Solution Approach 2:
The secondary check valve acts as an intermediary element between the external environment and the battery pack interior. It mediates by allowing water vapor to pass through while blocking liquid, thereby protecting the primary drain valve from frequent opening during intermittent liquid events while maintaining overall drainage functionality.
2Productivity
If the primary drain valve opens frequently to drain intermittent liquid, then liquid removal is achieved, but liquid ingress risk increases and system integrity is compromised
Solution Approach 1:
The system is divided into two specialized valves with distinct functions: the primary drain valve optimized for liquid removal and the secondary check valve optimized for liquid ingress prevention. This functional segmentation allows each valve to excel at its specific task, resolving the contradiction between liquid removal capability and liquid ingress prevention.
Solution Approach 2:
The secondary check valve serves as a protective intermediary that filters out liquid from intermittent liquid events while allowing vapor passage. This intermediary protects the primary drain valve and battery pack interior from liquid ingress while maintaining the system's overall liquid removal capability through the primary valve when needed.
3Device complexity
If a single drain valve is used, then device complexity is low, but the ability to differentiate between vapor and liquid drainage is insufficient
Solution Approach 1:
The drain assembly is segmented into two specialized valves: a primary drain valve for liquid drainage and a secondary check valve for vapor permeability with liquid blocking. This segmentation provides the adaptability to differentiate between vapor and liquid while maintaining relatively simple individual valve structures, resolving the contradiction between device complexity and selective drainage capability.
Solution Approach 2:
The secondary check valve performs multiple functions: it allows water vapor to pass through while blocking liquid, and it protects the primary drain valve from frequent opening. This multi-functionality increases system adaptability without proportionally increasing overall complexity, as both valves work together as an integrated system.
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 dual-valve system effectively reduces the frequency of primary drain valve opening during intermittent liquid events, while ensuring efficient drainage during high flowrate events, thereby preventing liquid ingress and maintaining the integrity of the battery pack housing.
Implementation Method 1
the secondary drain valve is formed of a membrane that, when the secondary drain valve is closed, allows water vapor to pass through while preventing liquid from passing through
Data Source
AI summary
A battery pack drain assembly includes a drain housing having an outer wall that is annular and an inner wall that is annular, an annular channel defined between the outer wall and the inner wall, and a primary drain valve disposed at least partially within the inner wall. The primary drain valve is configured to open when liquid in the drain housing reaches a top of the inner wall.