Battery Cell End Cap Lap Structure for Hermetic Sealing
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Solution Overview
Problem
The connection between the end cap and the housing of a battery cell affects the hermeticity and performance of the battery, and existing solutions struggle to provide effective sealing, especially when the housing lacks a step structure, impairing the connection and sealing performance.
Innovation Solution
An end cap design featuring a body portion and an edge portion with a lap portion that protrudes perpendicular to the thickness direction, allowing the first surface to lap the housing, and optionally including a second surface flush with the outer surface for improved connection, along with a connecting portion and grooves for enhanced structural strength and sealing, facilitates better sealing performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the end cap uses a conventional design without a lap portion, then the structure is simple and easy to manufacture, but the sealing performance and hermeticity of the battery cell deteriorate
Solution Approach 1:
The end cap is divided into distinct functional segments: a body portion for structural support and a separate edge portion with a lap portion for sealing. This segmentation allows each part to optimize its specific function - the body provides strength while the lap portion provides sealing contact with the housing, resolving the contradiction between simple structure and sealing performance.
Solution Approach 2:
The lap portion extends in a direction perpendicular to the thickness direction of the body portion, adding a dimensional element that enables sealing contact with the housing. This dimensional extension transforms the end cap from a simple flat component to one with multi-directional functionality, achieving both structural integrity and sealing performance.
2Reliability
If the end cap includes a lap portion protruding perpendicular to the thickness direction, then the connection and hermeticity improve, but the manufacturing complexity increases
Solution Approach 1:
The body portion and edge portion are integrated into a single end cap component, combining the sealing function of the lap portion with the structural function of the body. This merging eliminates the need for separate sealing components and assembly steps, improving hermeticity while maintaining manufacturing efficiency through integrated fabrication.
3Strength
If the end cap design includes additional features like grooves and connecting portions, then the structural strength and sealing performance improve, but the manufacturing process becomes more complex
Solution Approach 1:
The end cap incorporates localized features such as grooves and connecting portions at specific locations to enhance structural strength and sealing where needed, rather than uniformly complicating the entire structure. The grooves provide localized stress distribution and the connecting portions provide localized reinforcement, achieving strength enhancement with minimal geometric complexity.
Data Source
AI summary
This application provides an end cap, a battery cell, a battery, and an electrical device. The end cap includes a body portion and an edge portion. The edge portion is connected to the body portion and surrounds the body portion. The edge portion protrudes beyond the body portion along a first direction. The first direction is a thickness direction of the body portion. The edge portion includes a lap portion. The lap portion protrudes beyond the body portion along a second direction. The lap portion includes a first surface. The first surface is perpendicular to the first direction. The first surface is configured to lap a housing of the battery cell. The second direction is perpendicular to the first direction. The technical solutions of this application improve the sealing performance of the battery cell.