Battery Casing Sealing Assembly for Leak-Resistant Power Feedthroughs
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Solution Overview
Problem
The threading of a power line through a casing in battery cells leads to electrolyte leakage due to the sealing inefficiencies of existing methods, such as sealant filling and coating, which can result in electrolyte corrosion or leakage from the interface between the power line and the through hole.
Innovation Solution
A casing assembly with a sealing assembly that includes a conductive member, an insulating member, and a connecting member, where the insulating member covers the conductive member and is disposed in the connecting member's inner cavity, with contact portions exposed on the inner and outer sides of the casing, allowing the power line to connect internally while being sealed externally, thereby reducing electrolyte leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a power line is threaded through a through hole in the casing to connect the heating apparatus, then electrical connection is achieved, but electrolyte leakage occurs due to poor sealing
Solution Approach 1:
The sealing assembly is divided into multiple functional components: a connecting member for mechanical connection to the casing, a conductive member for electrical conduction, and an insulating member for electrical insulation. This segmentation allows each component to perform its specific function optimally while working together to prevent electrolyte leakage.
Solution Approach 2:
The conductive member is nested within the insulating member, which in turn is nested within the connecting member. This nested structure allows the power line to pass through the connecting member while being insulated and protected, preventing electrolyte contact while maintaining electrical connectivity.
2Ease of operation
If a power line is threaded through the casing, then electrical connection is achieved, but the sealing structure becomes complex and unreliable
Solution Approach 1:
The connecting member integrates multiple functions into a single component: mechanical connection to the casing, guidance for the power line, and structural support for the insulating and conductive members. This merging simplifies the overall sealing structure while maintaining ease of electrical connection.
Solution Approach 2:
The sealing assembly is designed as a universal component that can be applied to various through holes in the casing regardless of their specific positions. The modular design allows the same sealing assembly to serve multiple sealing points, reducing overall system complexity.
Data Source
AI summary
A casing assembly, a battery cell, a battery, and an electric apparatus are disclosed. The casing assembly includes a casing and a sealing assembly. The casing has a through hole, and the sealing assembly seals the through hole. The sealing assembly includes an insulating member that covers a conductive member. The conductive member includes a first contact portion and a second contact portion. A connecting member with a hollow inner cavity is connected to the casing, and the insulating member fills the inner cavity. The first contact portion is located on the inner side of the casing, and the second contact portion is located on the outer side. This structure allows the sealing assembly to block the through hole and helps prevent electrolyte leakage, thereby enhancing the sealing performance of the casing.