Battery Housing Pressure Venting With Ramp-Fastened Closure Cap
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Solution Overview
Problem
Existing pressure compensation devices for battery housings face challenges in achieving precise and rapid emergency degassing, particularly due to manufacturing tolerances, inhomogeneous material properties, and the need for high differential pressures to separate the protective cap.
Innovation Solution
A pressure compensation device featuring a ramp fastening device with a pressure element pressed onto a ramp body, allowing the closure cap to be deflected at lower differential pressures and enabling precise control over the emergency degassing process through non-positive locking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a protective cap with positive engagement is used to protect the membrane, then the membrane is protected from mechanical damage during normal operation, but the switching point for separation cannot be precisely determined and high differential pressures are required to achieve separation
Solution Approach 1:
The patent replaces the mechanical positive engagement system with a magnetic coupling system. The magnetic coupling allows the protective cap to be held in place during normal operation without physical interlocking, enabling precise control of the separation switching point through magnetic field strength adjustment rather than mechanical tolerance management.
Solution Approach 2:
The patent changes the holding mechanism from mechanical (positive engagement) to magnetic (magnetic coupling), allowing the holding force to be precisely controlled by adjusting magnetic field parameters. This enables accurate determination of the separation switching point while maintaining membrane protection during normal operation.
2Stability of the object's composition
If positive engagement connection is used between protective cap and base body, then the protective cap is securely held, but comparatively high differential pressures or forces are required to achieve separation
Solution Approach 1:
The patent substitutes the mechanical positive engagement connection with a magnetic coupling system. The magnetic field provides secure holding during normal operation with significantly lower forces than mechanical interlocking, and allows easy separation when the magnetic holding force is overcome by differential pressure, reducing the required separation force.
3Ease of manufacture
If plastic material is used in positive contact for protective cap, then the device is lightweight and easy to manufacture, but aging problems occur and the switching point cannot be kept constant over service life
Solution Approach 1:
The patent replaces mechanical contact elements made of plastic with magnetic coupling elements. This eliminates aging-related dimensional changes and material property variations in plastic, ensuring the switching point remains constant over the service life while maintaining ease of manufacture through standardized magnetic components.
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 solution allows for faster and more precise emergency degassing, reducing the risk of mechanical failure in battery housings by ensuring accurate pressure compensation at lower differential pressures, thus enhancing the reliability and longevity of the pressure compensation device.
Implementation Method 1
The pressure element is pressed onto the ramp of the ramp body with a contact pressure
Data Source
AI summary
A pressure compensation device for a battery housing includes a base body fluid-tightly connectable to an edge of a pressure compensation opening of the battery housing, and including a gas passage opening, a closure cap configured to, when a predetermined pressure difference between an interior space of the battery housing and an environment of the battery housing is exceeded, deflect in an axial direction from an initial position in a normal operating state of the pressure compensation device to transfer the pressure compensation device into an emergency degassing state, and a ramp fastening device configured to connect the closure cap and the base body, and including a ramp body disposed on the base body and extending in the axial direction, the ramp body including ramps on sides of the ramp body and facing away from one another in a radial direction.