Battery End Cover Venting Structure for Short-Circuit Isolation
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Solution Overview
Problem
Current energy-storage apparatuses face safety hazards due to irreversible side reactions, such as solid electrolyte interphase decomposition and gas release, which can lead to heat generation, gas expansion, smoke, and thermal runaway, especially under abnormal conditions like high temperature, short circuits, or mechanical stress.
Innovation Solution
An end cover assembly is designed with an explosion-proof-valve holder and insulation holder, featuring a receiving space and airflow channels to isolate the explosion-proof-valve holder from the electrode assembly, preventing short circuits and facilitating airflow to manage gas release safely.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the explosion-proof-valve holder is directly connected to the electrode assembly, then the structural complexity is reduced, but the risk of short circuit and thermal runaway increases
Solution Approach 1:
The end cover assembly is segmented into multiple functional components: the end cover body, the explosion-proof-valve holder, and the insulation holder. The insulation holder acts as an intermediate component that physically separates the explosion-proof-valve holder from the electrode assembly, preventing direct contact while maintaining structural integrity. This segmentation resolves the contradiction by adding a protective interface that eliminates short-circuit risks without significantly increasing overall structural complexity.
Solution Approach 2:
The insulation holder serves as an intermediary component between the explosion-proof-valve holder and the electrode assembly. It provides electrical insulation and physical separation, ensuring that the explosion-proof-valve holder does not directly contact the electrode assembly. This intermediary structure prevents short circuits while maintaining the explosion-proof functionality, thereby improving safety performance without excessive complexity increase.
2Reliability
If airflow channels are added to isolate the explosion-proof-valve holder, then the safety performance is improved, but the device complexity increases
Solution Approach 1:
The end cover assembly is divided into functional zones separated by the insulation holder, creating distinct regions for the electrode assembly and the explosion-proof-valve holder. Airflow channels are integrated into this segmented structure, allowing controlled air movement between regions. This segmentation approach improves safety by preventing direct contact and enabling thermal management, while the channels are incorporated as part of the overall structural design rather than separate additions.
Solution Approach 2:
The insulation holder and airflow channels are merged into a single integrated component structure. The insulation holder not only provides electrical isolation but also incorporates airflow passage features that enable thermal management and gas venting. This merging reduces the need for separate components, thereby improving safety functionality while minimizing the increase in device complexity.
3Object-affected harmful factors
If the explosion-proof-valve holder is isolated from the electrode assembly, then the risk of short circuit is reduced, but the structural complexity increases
Solution Approach 1:
The insulation holder acts as an intermediary component that provides electrical isolation between the explosion-proof-valve holder and the electrode assembly. It is positioned between these two components, ensuring that no direct electrical contact occurs. This intermediary structure effectively reduces short-circuit risk while adding only one additional component, thereby limiting the increase in structural complexity to a manageable level.
Solution Approach 2:
The insulation holder performs multiple functions simultaneously: it provides electrical insulation, structural support, and positioning for the explosion-proof-valve holder. By consolidating these functions into a single component, the design reduces the need for multiple separate parts, thereby minimizing the increase in structural complexity while effectively addressing the short-circuit risk.
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 enhances the safety performance of energy-storage apparatuses by preventing short circuits and managing gas release effectively, reducing the risk of thermal runaway and improving overall safety.
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 main body plate in the thickness direction of the main body plate. The second wall plate bends and extends away from the main body 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.