Battery Pack Drain Valve Logic for External Fluid Blocking
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Solution Overview
Problem
Existing drain assemblies for vehicle battery packs can unintentionally allow external fluids to enter the pack, especially in wet environments, which can impair operation and increase the risk of thermal runaway.
Innovation Solution
A drain assembly with a conduit, valve, and sensors that detects the presence of internal and external fluids, using a processor to control the valve and prevent external fluids from entering while allowing internal fluids to drain.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a drain assembly is provided to allow fluid drainage from the battery pack, then internal fluids can drain out effectively, but external fluids can unintentionally enter the battery pack in wet environments
Solution Approach 1:
The exterior sensor detects the presence of external fluid before it can enter the battery pack through the drain assembly. The processor receives this detection signal and proactively closes the valve in advance, preventing the harmful external fluid from contaminating the internal environment. This preliminary detection and preventive action resolves the contradiction by maintaining drainage capability while blocking contamination pathways.
Solution Approach 2:
The valve transitions from a static open/closed state to a dynamic state controlled by sensor feedback. The processor continuously monitors exterior sensor signals and adjusts the valve position accordingly - open when safe, closed when external fluid is detected. This dynamic control allows the system to maintain reliability by adapting the drainage function to environmental conditions, preventing contamination while preserving drainage capability when needed.
2Object-affected harmful factors
If a valve is added to control fluid flow in the drain assembly, then external fluid entry can be prevented, but the device complexity increases
Solution Approach 1:
The processor acts as an intelligent intermediary between the exterior sensor and the valve, eliminating the need for complex mechanical linkages or manual control mechanisms. The sensor provides electronic detection of external fluid, the processor interprets this signal and makes the control decision, and the valve executes the command. This electronic control pathway simplifies the overall structure compared to mechanical control systems while effectively preventing external fluid contamination.
Solution Approach 2:
The patent replaces potential complex mechanical control mechanisms with an electronic control system consisting of sensors, a processor, and an electronically actuated valve. This substitution reduces mechanical complexity while improving reliability through electronic sensing and control. The electronic system can detect fluid presence and control the valve with simpler components than would be required for a purely mechanical solution.
3Measurement precision
If sensors and a processor are added to detect fluids and control the valve, then fluid management precision is improved, but the device complexity increases
Solution Approach 1:
The processor serves multiple functions within the fluid management system: it receives and processes signals from the exterior sensor, controls the valve actuation, and can interface with the vehicle's diagnostic system. By consolidating these control functions into a single processor unit, the patent achieves precise fluid detection and control without proportionally increasing complexity. The multi-functional processor justifies its addition by providing intelligent decision-making capabilities that simple mechanical systems cannot offer.
Data Source
AI summary
A vehicle includes a battery pack having a drain assembly. The battery pack is disposed within a housing. The drain assembly includes a conduit extending from a first end located within a housing of the battery pack to a second end outside of the housing. A valve within the conduit controls flow of a first fluid from the first end to the second end. An exterior sensor located exterior to the housing detects a presence of a second fluid outside of the housing. A processor places the valve in a closed state when the exterior sensor determines the presence of the second fluid to prevent the second fluid from flowing into the housing.