Battery Cell Terminal Structure for Lower-Heat Tab Welding
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Solution Overview
Problem
Existing battery cell technologies face challenges in enhancing safety due to high welding power requirements, heat generation, and potential damage to components during the welding process of current collecting members and electrode terminals, which can lead to safety hazards and reduced efficiency.
Innovation Solution
The introduction of a battery cell design featuring a concave portion on the electrode terminal to reduce the thickness of the connecting portion, thereby reducing welding power and heat generation, while also optimizing the welding portion's dimensions and structure to enhance safety and current capacity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the connecting portion is made thicker to ensure structural strength and current capacity, then the welding power required increases and heat generation rises, but this can burn other components and reduce safety
Solution Approach 1:
The connecting portion is designed with non-uniform thickness: thicker at the welding area to ensure welding strength and current capacity, and thinner at other areas to reduce heat generation and prevent damage to surrounding components. This local variation in thickness optimizes both structural requirements and thermal management during welding operations.
2Strength
If welding power is increased to ensure reliable connection between current collecting member and electrode terminal, then connection strength improves, but heat generation increases causing potential damage to components
Solution Approach 1:
The connecting portion features localized thickness variation with a thicker welding area that concentrates welding heat and stress, ensuring strong connections without exposing surrounding components to excessive heat. This local thickness optimization allows adequate welding power application while protecting adjacent components from thermal damage.
3Object-affected harmful factors
If the welding portion dimensions are optimized to reduce heat generation, then safety improves, but current capacity may be reduced
Solution Approach 1:
The connecting portion is designed with a thicker welding area specifically at the connection zone to maintain adequate current capacity and welding strength, while other portions are thinner to reduce overall heat generation. This spatial differentiation allows the welding portion to handle high current demands without requiring the entire component to be thick, thus balancing thermal management with 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
This design effectively reduces the risk of component damage, enhances safety by minimizing heat and power consumption during welding, and improves current capacity and temperature control, particularly during fast charging.
Implementation Method 1
The current collecting member is welded to the connecting portion
Data Source
AI summary
Embodiments of this application provide a battery cell, a battery, and an electric apparatus. The battery cell may include an electrode assembly, a housing, an electrode terminal, and a current collector. The electrode assembly may include a first tab. The housing may be configured to accommodate the electrode assembly. The electrode terminal may be disposed in the housing, and the electrode terminal may include a first concave portion and a connecting portion at the bottom of the first concave portion. The current collector may be connected to the first tab and welded to the connecting portion.