Battery Cell Terminal Plate Guide Lines for Precise Laser Welding
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Solution Overview
Problem
In battery packs, accurately identifying and maintaining the position of rivet terminals during laser welding is challenging due to accumulated tolerances and coverage by bus bars, making it difficult to ensure welding quality.
Innovation Solution
Incorporating guide lines on terminal plates that pass through the center of rivet terminals, allowing for easy identification of the terminal centers and enabling precise welding line formation to avoid the rivet terminals during the welding process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If rivet terminal is covered by bus bar during welding, then welding protection is improved, but welding quality inspection becomes difficult
Solution Approach 1:
A guide line is introduced as an intermediary element on the terminal plate to indicate the position of the rivet terminal center. This guide line allows the welding quality to be inspected by providing a reference for probe measurement without exposing the rivet terminal itself, thus maintaining both protection and inspectability.
2Manufacturing precision
If position of cell terminal is maintained at accurate distance, then welding accuracy is improved, but position maintenance becomes difficult due to accumulated tolerances
Solution Approach 1:
The guide line is formed directly on the terminal plate itself, making the positioning reference self-contained and independent of external fixtures or complex assembly tolerances. This allows the terminal to self-indicate its correct position for welding without requiring precise maintenance of distances during stacking.
3Measurement precision
If guide line is added on terminal plate, then center identification is improved, but device complexity increases
Solution Approach 1:
The guide line utilizes visual contrast (color or reflectivity difference) on the terminal plate surface to indicate the center position. This simple visual change provides precise center identification without adding mechanical complexity or additional components to the terminal plate structure.
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
Facilitates accurate identification of rivet terminal centers and ensures that the welding line avoids the rivet terminals, improving the quality and reliability of the welding process in battery cell assembly.
Implementation Method 1
The bus bars may be electrically connected to the terminals of the battery cells by laser welding
Data Source
AI summary
A battery cell including an electrode assembly and a cap assembly. The cap assembly includes a terminal plate, a negative electrode terminal, and a positive electrode terminal. The negative electrode terminal and the positive electrode terminal respectively include a rivet terminal electrically connecting the terminal plate and the electrode assembly, and each of the terminal plates has a guide line on a plate surface thereof and passing through a center of the rivet terminal.