Battery Valve Assembly for Thermal Runaway Fire Suppression
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Solution Overview
Problem
Fire caused by thermal runaway of battery cells inside batteries is difficult to control due to the sealed environment of the battery box body, which prevents effective entry of fire-fighting mediums.
Innovation Solution
A valve system is integrated into the battery, featuring a valve body with a medium injection port connected to a fire-fighting device and a closing member that opens the port when internal pressure or temperature reaches a threshold, allowing the fire-fighting medium to enter the battery box body.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the battery box body is sealed to protect the battery cell, then the battery is protected from liquid or foreign matters, but fire caused by thermal runaway is difficult to control due to inability to inject fire-fighting medium
Solution Approach 1:
The valve body is divided into separate functional components: a mounting member with injection ports for fire-fighting medium, and a pressure relief member with relief ports for pressure release. This segmentation allows independent optimization of each function while maintaining the sealed box body structure.
Solution Approach 2:
The valve assembly acts as an intermediary device between the sealed box body and the external fire-fighting system. It provides controlled access points (injection ports and relief ports) that enable fire-fighting medium entry and pressure release without compromising the overall sealed structure.
2Reliability
If the box body remains sealed during normal operation, then the battery cell is protected, but when thermal runaway occurs the pressure cannot be relieved and fire cannot be suppressed
Solution Approach 1:
The pressure relief member is designed with a closing member that dynamically responds to internal pressure conditions. When pressure or temperature reaches threshold values during thermal runaway, the closing member automatically opens to allow pressure relief, then closes again when conditions normalize, providing dynamic protection.
Solution Approach 2:
The valve system is designed to automatically detect and respond to thermal runaway conditions without external intervention. The closing member self-activates when pressure or temperature thresholds are reached, providing autonomous pressure relief and fire suppression capabilities.
3Object-affected harmful factors
If a valve structure is added to enable fire-fighting medium injection, then fire control capability is improved, but the device complexity increases
Solution Approach 1:
The valve assembly performs multiple functions through integrated components: the mounting member provides both injection ports for fire-fighting medium and structural support, while the pressure relief member provides both pressure relief and sealing functions. This multi-functionality reduces the need for separate dedicated components.
Solution Approach 2:
The injection ports and relief ports are integrated into a unified valve body structure that mounts to the box body as a single assembly. The closing member simultaneously controls both the injection port and relief port, merging multiple control functions into one mechanism.
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 valve system effectively relieves pressure and allows fire-fighting mediums to cool the battery cell, quickly controlling fires and reducing economic losses by preventing large-area thermal diffusion.
Implementation Method 1
the closing member being configured to open the medium injection port when a pressure or a temperature inside the box body reaches a threshold
Implementation Method 2
when a pressure or a temperature inside the box body reaches a threshold
Implementation Method 3
the fire-fighting medium provided by the fire-fighting device may enter the box body through the medium injection port, so as to cool the battery cell inside the box body and reduce the risk of large-area thermal diffusion
Data Source
AI summary
Embodiments of the present application provide a valve, a battery, a power consumption device and an apparatus and a method for manufacturing the valve, and belong to the technical field of batteries. The valve includes a valve body and a closing member, the valve body being provided with a medium injection port. The closing member is configured to open the medium injection port when a pressure or a temperature inside the box body reaches a threshold, so as to relieve the pressure inside the box body and allow the fire-fighting device to inject a fire-fighting medium into the box body. The fire-fighting device can be connected to the medium injection port, and the fire-fighting medium can enter the box body, so as to cool the battery cell inside the box body and reduce the risk of large-area thermal diffusion of the battery cell inside the box body.