Battery Electrode Terminal Riveting With Fluorine Resin Gasket
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Solution Overview
Problem
Existing battery cell structures face issues with high internal resistance, heat generation during rapid charging, and low space efficiency, which limit energy density and complicate electrical connections for battery packs in vehicles.
Innovation Solution
A riveting structure for the electrode terminal using a fluorine resin gasket and a flange design that enhances the cross-sectional area of the current path, prevents short circuits, and allows for efficient electrical wiring within the battery can.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a strip-shaped electrode tab is used to connect the electrode assembly to the electrode terminal, then the battery cell structure is simple, but the current collection efficiency is poor, resistance is high, and heat is generated
Solution Approach 1:
The patent merges the electrode terminal with the battery can by riveting the electrode terminal to the battery can bottom, eliminating the need for separate strip-shaped electrode tabs. The electrode terminal and battery can are integrated into a single structural unit, improving current collection efficiency while simplifying the overall structure.
Solution Approach 2:
The electrode terminal transitions from a two-dimensional strip shape to a three-dimensional cup-shaped structure with a bottom and side walls. This dimensional change increases the effective contact area with the electrode assembly and improves current collection efficiency.
2Reliability
If the battery can bottom is sealed completely, then the battery cell structure is simple, but the electrode terminal cannot be electrically connected to the battery can
Solution Approach 1:
The battery can bottom is segmented into two functional zones: a sealed peripheral region for maintaining structural integrity and preventing short circuits, and a central through-hole region for electrical connection. This segmentation allows both sealing and electrical connection functions to coexist.
Solution Approach 2:
The electrode terminal serves multiple functions: it provides electrical connection through the through-hole, maintains sealing at its periphery through riveting, and structurally supports the electrode assembly. This multi-functionality reduces the need for separate components.
3Reliability
If a through-hole is formed in the battery can bottom for electrode terminal insertion, then electrical connection is improved, but sealing reliability may be compromised
Solution Approach 1:
An insulating gasket is pre-installed around the through-hole before electrode terminal insertion. This gasket provides beforehand protection against short circuits by electrically isolating the electrode terminal from the battery can, while maintaining the sealing function of the battery can bottom.
4Quantity of substance
If the electrode terminal has a simple insertion structure, then manufacturing is easy, but space efficiency and current path area are limited
Solution Approach 1:
The electrode terminal is merged with the battery can through riveting, eliminating the need for separate insertion structures and reducing internal space occupation. The integrated structure improves space efficiency while maintaining manufacturing simplicity.
Solution Approach 2:
The electrode terminal adopts a cup-shaped three-dimensional structure with a bottom and side walls, increasing the current path cross-sectional area without significantly increasing the overall footprint. This dimensional optimization improves both space efficiency and electrical performance.
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 reduces internal resistance, increases energy density, and improves space efficiency while preventing short circuits and facilitating series/parallel connections, enhancing the performance of battery cells and packs.
Implementation Method 1
a gasket provided between the electrode terminal and an outer diameter of the through hole
Implementation Method 2
A riveting structure for the electrode terminal using a fluorine resin gasket and a flange design that enhances the cross-sectional area of the current path
Data Source
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AI summary
The present invention provides a riveting structure of an electrode terminal, and a cylindrical battery cell, a battery pack, and a vehicle including the same, and a riveting structure of an electrode terminal includes: a battery can with one side open; an electrode terminal riveted through a through hole formed in a bottom of the battery can; and a gasket provided between the electrode terminal and an outer diameter of the through hole, and the gasket includes a fluorine resin.