Battery Cell Current Collector Edge for Weld Heat Isolation
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Solution Overview
Problem
Damage to the electrode assembly during battery cell assembly leads to a decrease in yield rate, which existing technologies fail to address effectively.
Innovation Solution
A battery cell design featuring a current collecting component with a turned edge that protrudes away from the electrode assembly, increasing the distance to the weld joint and incorporating chamfer structures for efficient fitting and sealing, along with a supporting end cap and sealing layers to enhance assembly strength and hermeticity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the current collecting component is welded directly to the housing inner wall, then the assembly strength is improved, but the electrode assembly is damaged by heat transfer, reducing yield rate
Solution Approach 1:
The current collecting component is divided into a body portion and a first turned edge portion. The body portion is positioned close to the electrode assembly for electrical connection, while the first turned edge protrudes away from the electrode assembly to form the weld joint with the housing, segmenting the heat transfer path and protecting the electrode assembly from welding heat.
Solution Approach 2:
The first turned edge extends in a direction away from the electrode assembly, creating a spatial separation between the weld joint and the electrode assembly. This dimensional arrangement increases the distance for heat transfer, reducing thermal impact on the electrode while maintaining structural strength.
2Quantity of substance
If the current collecting component is positioned close to the housing wall for compact design, then the energy density is improved, but the electrode assembly is exposed to heat from the weld joint
Solution Approach 1:
Different portions of the current collecting component have different spatial orientations: the body portion is positioned close to the electrode assembly for compact design and high energy density, while the first turned edge protrudes away from the electrode assembly to shield it from welding heat, achieving local optimization of both compactness and heat protection.
3Productivity
If the assembly process is simplified for high productivity, then the manufacturing efficiency is improved, but the precision of fitting and sealing between components deteriorates
Solution Approach 1:
The chamfer structure is pre-formed on the current collecting component, creating a guiding feature that automatically aligns and positions the component during assembly. This preliminary structural preparation enables quick and precise fitting without complex assembly procedures, achieving both high productivity and manufacturing precision.
Solution Approach 2:
The chamfer structure acts as an intermediary element that facilitates the fitting process between the current collecting component and the housing. It provides a transition surface that guides alignment and ensures proper positioning, enabling precise sealing without requiring complex assembly operations.
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 design reduces heat transfer to the electrode assembly, improves assembly efficiency, enhances the yield rate, and increases the energy density and reliability of the battery cell.
Implementation Method 1
The first turned edge is welded to an inner peripheral wall of the housing
Implementation Method 2
the distance can be increased from the electrode assembly to a weld joint between the current collecting component and an inner wall of the housing, thereby effectively reducing the heat transferred to the electrode assembly
Data Source
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AI summary
This application discloses a battery cell (20), a battery (100), and an electrical device (1000). The battery cell (20) includes: a housing (21), an electrode assembly (22), and a current collecting component (23). The current collecting component (23) includes a body portion (231) and a first turned edge (232) disposed around the body portion (231). The first turned edge (232) extends away from the electrode assembly (22) from the body portion (231). The first turned edge (232) is welded to an inner peripheral wall of the housing (21). By disposing the first turned edge (232) around the body portion (231) and extending the first turned edge (232) away from the electrode assembly (22) from the body portion (231), the battery cell (20) disclosed herein can increase a distance between a weld joint and the electrode assembly (22), thereby preventing the electrode assembly (22) from being damaged by heat, and in turn, effectively improving the yield rate of the battery cell (20).