Bidirectional Battery Pressure Relief Valve for Sealing Stability
Solution Overview
Problem
Existing batteries face failure due to unstable internal and external pressures caused by factors like heating or altitude changes, leading to structural damage of the sealing surface and potential entry of water vapor or dust.
Innovation Solution
A bidirectional pressure relief valve is integrated into the battery, featuring a valve seat, first and second valve elements, and pressure relief holes. This valve automatically adjusts to balance internal and external pressures, preventing damage and external contamination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the battery is sealed to improve reliability and meet waterproof/dustproof requirements, then the battery's sealing performance is improved, but the internal pressure cannot be balanced with external pressure, leading to structural damage of the sealing surface
Solution Approach 1:
The pressure relief valve is divided into multiple functional components: a valve body with first and second valve elements, a partition plate dividing the channel into first and second cavities, and multiple pressure relief holes. This segmentation allows independent control of pressure relief in different directions and states, enabling the valve to maintain pressure balance while preserving sealing performance.
Solution Approach 2:
The valve elements are designed to dynamically respond to pressure differences between internal and external environments. The first valve element opens/closes the first pressure relief hole based on pressure differential, and the second valve element controls the second pressure relief hole, enabling adaptive pressure balancing that maintains both sealing integrity and pressure stability.
2Stability of the object's composition
If pressure relief holes are provided to balance internal and external pressure, then pressure balance is improved, but the sealing performance deteriorates due to potential entry of water vapor or dust
Solution Approach 1:
The bidirectional pressure relief valve acts as an intermediary device between the internal battery environment and external atmosphere. It selectively opens pressure relief holes only when pressure differential exceeds threshold values, allowing pressure equalization while blocking harmful factors like water vapor and dust during normal sealed operation.
Solution Approach 2:
The valve elements automatically respond to pressure differential without external control. When internal pressure exceeds external pressure, the first valve element opens the first pressure relief hole; when external pressure exceeds internal pressure, the second valve element opens the second pressure relief hole, enabling self-regulating pressure balance while maintaining sealing.
3Device complexity
If a simple pressure relief structure is used to enable pressure balance, then device complexity is reduced, but the ability to prevent harmful factors from entering the battery is compromised
Solution Approach 1:
The valve structure is segmented into distinct functional zones: first and second valve elements for bidirectional pressure control, partition plate separating cavities, and multiple pressure relief holes. This segmentation achieves comprehensive pressure balancing and contamination protection while maintaining reasonable structural complexity through modular design.
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 bidirectional pressure relief valve effectively balances internal and external pressures within the battery, reducing the risk of structural damage and external contamination, thereby enhancing the reliability and stability of the battery.
Implementation Method 1
the first valve element is located inside the first cavity and is configured to open or close the first pressure relief hole so as to be in communication with or be isolated from the first cavity and the second cavity
Implementation Method 2
the second valve element is located inside the second cavity and is configured to open or close a second pressure relief hole so as to enable or disable connection between the first cavity and the second cavity
Data Source
AI summary
Provided in the embodiments of the application are a bidirectional pressure relief valve, a battery and an electric device. The bidirectional pressure relief valve includes a valve seat, a first valve element and a second valve element, where the valve seat has a first end and a second end opposite each other, a channel and a partition plate, the channel penetrating the first end and the second end, a first pressure relief hole being provided on the partition plate, and the partition plate being arranged on an inner wall of the channel, and dividing the channel into a first cavity and a second cavity in an axial direction of the channel. The bidirectional pressure relief valve of the application can be applied to the battery to maintain balance between internal pressure and external pressure of the battery.