Battery Pressure Balancing Vent with Spring-Controlled Opening
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Solution Overview
Problem
Existing pressure balancing devices for electrochemical devices in vehicles suffer from variable opening pressures due to material deformation, imprecise operation ranges, high component complexity leading to assembly difficulties and increased costs, and inadequate gas flow geometry, which can result in inefficient pressure equalization and potential explosions.
Innovation Solution
A pressure balancing device with a spring-determined opening pressure, a concave cap geometry for increased fluid flow, integrated sealing elements for various battery thicknesses, and a mounting system without additional tools, ensuring precise and automatic pressure equalization with IP-rated sealing protection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If flexible material pressure balancing elements are used, then the device can adapt to pressure changes, but the opening pressure becomes imprecise and varies over time due to material deformation
Solution Approach 1:
The patent changes the material parameter from flexible to rigid, eliminating time-dependent deformation. The rigid cap maintains a constant opening pressure determined solely by the spring constant, preventing drift over time while still adapting to pressure changes through the mechanical opening/closing action.
Solution Approach 2:
The patent replaces the flexible material-based pressure sensing mechanism with a rigid mechanical system where the opening pressure is determined by the spring constant. This substitution eliminates the deformation issues of flexible materials while maintaining pressure-responsive functionality.
2Reliability
If multiple components are used in pressure balancing devices, then the sealing and pressure control functions are achieved, but the assembly complexity increases and production costs rise
Solution Approach 1:
The patent merges the cap and sealing element into a single integrated component. The cap itself incorporates the sealing function through its engagement with the body's groove and sealing element, eliminating the need for separate sealing components and simplifying assembly.
Solution Approach 2:
The cap serves multiple functions simultaneously: it seals the flow channel when closed, provides the opening pressure setting through its interaction with the spring, and maintains IP-rated protection. This multi-functionality reduces the overall component count while maintaining reliability.
3Productivity
If the cap geometry is flat or convex, then the structure is simple, but the gas flow discharge efficiency is inadequate
Solution Approach 1:
The patent applies curvature to the cap's lower surface, creating a concave geometry that actively directs and accelerates gas flow toward the discharge opening. This curved surface design improves discharge efficiency by utilizing fluid dynamics principles without adding mechanical complexity.
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 device provides consistent pressure equalization across varying conditions, reduces assembly complexity, and enhances safety by preventing explosions through precise fluid discharge and robust sealing, maintaining operational efficiency and compliance with IP ratings.
Implementation Method 1
at least one spring that allows the working pressure of the pressure of the pressure balancing device to be determined in direct proportion to the spring constant
Implementation Method 2
which provides fluid passage by opening the flow channel when a difference occurs between the internal pressure of the battery housing and the external environment pressure
Data Source
Figure 1~2
Figure 3
AI summary
The invention relates to a pressure balancing device (A) used for pressure balancing in batteries. The pressure balancing device (A) comprises a body (20) that is mounted on an opening of the battery housing (10) and having a flow channel (22) in its interior that allows fluid passage; a cover (30) positioned on the body (20), wherein the cover (30) prevents the fluid passage between the interior of the battery housing (10) and the exterior environment by closing the flow channel (22) when the internal pressure of the battery housing (10) and the external environment pressure are in balance, and wherein the cover (30) provides fluid passage by opening the flow channel (22) when a difference occurs between the internal pressure of the battery housing (10) and the external environment pressure; and also at least one spring (60), which enables the cover (30) to close automatically when the internal pressure of the battery housing (10) and the external environment pressure are balanced, and which ensures that the operating pressure of the pressure balancing device (A) is determined in direct proportion to the spring constant.