Battery Cell Solder Joint Layout for Uniform Tab Current
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Solution Overview
Problem
The uneven distribution of solder joints in the shape of a 'V' or Chinese character '' on electrode sheets results in non-uniform current flow, leading to energy loss and inefficiency in cylindrical batteries.
Innovation Solution
The solder joints are arranged at equal arc distances along the winding direction of the wound body, forming a uniform distribution pattern to ensure consistent current transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If full electrode tabs are soldered through laser soldering forming multiple solder joints in a 'V' or '' shape, then the electrode tabs are connected to the electrode sheets, but the current distribution becomes non-uniform with large current in some areas and small current in other areas
Solution Approach 1:
The patent segments the continuous solder joint pattern into multiple discrete solder joints arranged at equal arc distances along the winding direction. This segmentation of the electrode tab connection into multiple evenly distributed points ensures uniform current distribution across the electrode sheets, preventing the non-uniform current flow that occurs with traditional 'V' or '' shaped solder joint patterns.
2Reliability
If multiple solder joints are arranged at equal arc distances along the winding direction, then current uniformity is improved, but the manufacturing complexity increases due to precise positioning requirements
Solution Approach 1:
The patent employs preliminary action by using simulation technology before the actual soldering process. The simulation outputs the optimal winding shape and soldering trajectory, allowing the equal arc distance positioning of multiple solder joints to be determined in advance. This preliminary simulation guides the actual manufacturing, making the precise positioning of solder joints more manageable and reducing the difficulty of achieving uniform current distribution.
3Ease of manufacture
If traditional laser soldering forms solder joints in 'V' or '' shape patterns, then the electrode tabs are connected to current collecting parts, but additional current paths are created causing energy loss
Solution Approach 1:
The patent inverts the traditional soldering approach by changing from forming continuous or clustered solder joints in 'V' or '' shapes to creating discrete solder joints at equal arc distances along the winding direction. This inversion of the solder joint arrangement eliminates the creation of additional unnecessary current paths, ensuring that current flows uniformly through the electrode sheets without the energy losses associated with traditional soldering patterns.
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
Uniform current distribution reduces energy loss and improves efficiency by minimizing additional current paths and enhancing current uniformity across the electrode sheets.
Implementation Method 1
current collecting parts, soldered to sides, facing away from the wound body, of the full electrode tabs to form multiple solder joints
Data Source
AI summary
A soldering structure and a soldering method for a battery cell, and a battery are provided, relating to the field of battery technology. The soldering structure for the battery cell includes a wound body; full electrode tabs, formed at ends of the wound body; and current collecting parts, soldered to sides, facing away from the wound body, of the full electrode tabs to form multiple solder joints; in which the multiple solder joints are arranged at equal arc distances along a winding direction of the wound body. The multiple solder joints are arranged at equal arc distances along the winding direction of the wound body, so that the solder joints can be uniformly distributed on the full electrode tabs along the winding direction, and a current can be uniformly transmitted into the wound body through the full electrode tabs, reducing the current loss.