End Cover Airflow Channel Structure for Battery Vent Safety
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Solution Overview
Problem
Current energy-storage apparatuses face safety hazards due to irreversible side reactions, such as solid electrolyte interphase film decomposition and gas release, which can lead to heat generation, gas expansion, and potential fires under abnormal conditions like high temperature, short circuits, or impacts.
Innovation Solution
An end cover assembly is designed with an explosion-proof-valve holder and insulation holder, featuring a specific airflow channel structure and spacing distances to prevent contact with the electrode assembly and facilitate airflow, thereby preventing short circuits and foreign matter entry, while the insulation holder is made of materials like polypropylene for enhanced safety.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the end cover assembly is designed with a compact structure to reduce space occupation, then the device size is reduced, but the airflow channel may be blocked and safety performance deteriorates
Solution Approach 1:
The patent utilizes the thickness direction of the main body plate to create airflow channels by recessing the vent hole inner wall and the baffle edge, forming notches that extend into the plate thickness. This dimensional approach allows airflow channels to be integrated within the compact cover structure without increasing external dimensions, resolving the contradiction between compact size and adequate airflow for safety.
Solution Approach 2:
The explosion-proof-valve holder and insulation holder are nested within the end cover assembly structure, with the insulation holder containing the explosion-proof-valve holder. This nesting arrangement allows multiple functional components to be integrated into a compact overall structure while maintaining their individual functions, including the airflow channels and spacing requirements.
2Reliability
If the spacing distance between the insulation holder and explosion-proof-valve holder is increased to prevent foreign matter entry, then safety is improved, but the device complexity increases
Solution Approach 1:
The patent combines the insulation holder and explosion-proof-valve holder into a single integrated end cover assembly, with both components molded as one piece or closely coupled. The airflow channels are formed by the integrated structure of the main body plate, wall plates, and holders, creating a unified design that prevents foreign matter entry through controlled spacing without requiring separate complex protective structures.
Solution Approach 2:
The end cover assembly serves multiple functions: it provides structural closure, creates airflow channels for safety, prevents foreign matter entry through controlled spacing, and houses both the insulation holder and explosion-proof-valve holder. This multi-functionality reduces the need for additional separate components, maintaining simplicity while achieving comprehensive safety.
3Temperature
If the airflow channel is enlarged to improve heat dissipation, then thermal safety is improved, but the risk of foreign matter entry increases
Solution Approach 1:
The patent uses the thin plate structures of the main body plate and wall plates to create controlled airflow paths through recessed notches. These thin film-like structures provide sufficient airflow for heat dissipation while maintaining precise control over the opening dimensions, preventing foreign matter entry through carefully designed spacing and notch geometries that allow air passage but block particles.
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 effectively enhances the safety performance of energy-storage apparatuses by preventing short circuits and foreign matter entry, reducing the risk of thermal runaway and fires, and ensuring reliable airflow for improved safety and stability.
Implementation Method 1
The main body plate, the first wall plate, and the second wall plate are all spaced apart from the explosion-proof-valve holder to form a first airflow channel
Data Source
AI summary
An end cover assembly, an energy-storage apparatus, and an electricity-consumption device are provided. A main body plate of an insulation holder includes a first surface and a second surface. A first wall plate and a second wall plate of the holder are both provided on the first surface and opposite to each other in the length direction of the main body plate. The first wall plate bends and extends away from the second wall plate in the thickness direction of the main body plate. The second wall plate bends and extends away from the first wall plate in the thickness direction of the main body plate. The main body plate, the first wall plate, and the second wall plate jointly define a receiving space to receive the explosion-proof-valve holder, and are all spaced apart from the explosion-proof-valve holder to form an airflow channel.