Battery Cell Terminal Structure for Shielded Welding Reliability
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Solution Overview
Problem
Batteries face risks of thermal runaway and short circuits due to metal residues and high-temperature welding processes, affecting reliability and performance.
Innovation Solution
A battery cell design with a post terminal structure that shields welding parts away from the active substance-coated part, incorporates accommodating grooves for conductive parts, and uses cover plates to protect and simplify the welding process, reducing metal residue entry and improving assembly efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the welding part is located on the post terminal body close to the active substance-coated part, then the welding process is simplified, but metal residues may enter the battery cell interior and cause short circuits, and high temperature may damage the active substance-coated part
Solution Approach 1:
The post terminal body is divided into two distinct surfaces: a first surface facing the active substance-coated part and a second surface away from it. The welding part is specifically located on the second surface, separating the welding operation from the active substance-coated part. This segmentation prevents metal residues from entering the battery cell interior and eliminates the risk of high-temperature damage to the active substance, while still allowing for simplified welding processes.
2Reliability
If the welding part is located on the post terminal body away from the active substance-coated part, then metal residues are prevented from entering the battery cell and high temperature damage is reduced, but the welding process complexity increases
Solution Approach 1:
The post terminal body serves multiple functions: it provides electrical connection, structural support, and a designated welding surface. By incorporating the welding part on the second surface of the post terminal body, the structure achieves short circuit prevention while maintaining manufacturing simplicity. The post terminal body's design integrates these functions without requiring additional complex components or structures.
3Reliability
If the first cover plate is used to shield the welding part, then the connection reliability is improved by protecting against high temperature, but the device complexity increases
Solution Approach 1:
The welding part is extracted and located on the second surface of the post terminal body, away from the active substance-coated part. The first cover plate is configured to shield this welding part, protecting it from high-temperature damage during battery cell assembly. This extraction and protective shielding approach improves connection reliability while minimizing structural complexity through functional integration.
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
Reduces the likelihood of short circuits, enhances reliability and service life by minimizing metal residue exposure and optimizing the welding process, while increasing energy density and reducing production costs.
Implementation Method 1
the first cover plate is configured to shield the first welding part... the first cover plate can play a protective role by shielding the first welding part, which reduces the influence of the high temperature generated when the post terminal body is welded to the busbar component on the first welding part
Implementation Method 2
the conductive part is connected to the post terminal body through a first welding part... When the post terminal body and the conductive part are welded at high temperature to form the first welding part
Data Source
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AI summary
A battery cell, a battery, and an electrical device. The battery cell comprises: a casing assembly, comprising a casing and a first pole, the first pole comprising a pole body and a first cover plate, the pole body being mounted in the casing, and the first cover plate being arranged on the pole body; and a cell assembly, comprising an active material coating portion and a conductive portion connected to the active material coating portion, the active material coating portion being accommodated in the casing, and the conductive portion being connected to the pole body by means of a first welding portion. The first welding portion is at least partially located on the side of the pole body away from the active material coating portion, and the first cover plate is used for shielding the first welding portion. The present application can improve the reliability of a battery cell.