Battery Safety Valve Leaf Spring Ejection Mechanism
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Solution Overview
Problem
Existing safety valves for battery housings in vehicles are either inefficient in emergency degassing due to temperature-dependent mechanical properties, require puncturing of membranes, or have limited degassing surfaces, leading to larger and more expensive designs.
Innovation Solution
A safety valve with a specially shaped and fastened spring element that allows the central part to be ejected upon increased pressure, enabling full opening for gas and particle discharge, while maintaining a waterproof and air-permeable membrane for effective pressure relief.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the valve surface area is limited, then the valve remains compact and cost-effective, but the degassing capacity is insufficient for emergency pressure relief
Solution Approach 1:
The valve transitions from a static sealed state to a dynamic fully-open state during emergency discharge. The spring mechanism allows the valve body to be ejected completely from its seat, creating a large effective opening area that exceeds the valve's external dimensions, thus providing high degassing capacity without requiring a large valve body.
2Reliability
If a spring element is used to ensure sealing force, then the valve maintains reliable sealing during normal operation, but the spring must be strong enough to potentially prevent full opening during emergency discharge
Solution Approach 1:
The spring's operational parameters are optimized to provide sufficient pre-compression force for sealing during normal operation, but its design allows for complete decompression and valve ejection when pressure differential exceeds the spring force. The spring acts as a controlled resistance that ensures sealing but yields completely when emergency discharge is required.
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
Ensures reliable and efficient emergency degassing with full opening of the valve, reducing pressure and removing hard particles, while maintaining sealing during normal operation and being cost-effective and compact.
Implementation Method 1
a spring element (2), which ensures a force between the housing (3) and the valve element (5, 6, 7)
Implementation Method 2
a liquid impermeable and air permeable membrane (6)
Data Source
Figure 1
Figure 2
Figure 3~4
AI summary
The present invention belongs to the field of batteries, in particular to the field of constructional details of non-active parts such as housings, lids or deaeration systems for discharging gases from the interior of batteries. The invention relates to a safety pressure valve for installation on a housing of a battery, which may be used in electric or hybrid vehicles, vessels or aircrafts. The valve according to the invention comprises at least the following components: - a housing, - a valve element removably connected to the housing, and comprises a valve frame and a lid, between which a liquid impermeable and air permeable membrane is installed, - a seal installed between the housing and the valve element, and - a spring element, which ensures a force between the housing and the valve element in normal operation, and which enables ejection of the valve element in case of emergency degassing. The spring element is installed between the housing and the valve frame and is shaped as a leaf spring, which pushes onto the valve housing on a surface facing towards the battery housing interior, and on the valve element on a surface facing towards the battery housing exterior. In case of emergency degassing the spring element loses a contact with the valve element and/or the housing.