Battery Cell Top Cover Protrusion for Weld Laser Shielding
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Solution Overview
Problem
Laser leakage and particles entering the accommodating space during the welding process of battery cells can cause damage to the electrode assembly.
Innovation Solution
A battery cell design featuring a top cover with a protrusion that shields the electrode assembly from laser leakage and particle entry by blocking the connection area between the top cover and the housing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If laser welding is used to connect the top cover to the housing, then the connection strength and sealing performance are improved, but laser leakage and particles may enter the accommodating space causing damage to the electrode assembly
Solution Approach 1:
A protrusion structure is introduced as an intermediary element between the top cover and the electrode assembly. This protrusion extends into the accommodating space and positions itself between the welding area and the electrode assembly, serving as a physical barrier that blocks laser leakage and particles while allowing the welding process to proceed normally at the top cover housing connection
Solution Approach 2:
The top cover is segmented by adding a protrusion structure that divides the internal space. This segmentation creates a protected zone for the electrode assembly by separating it from the welding zone, allowing the laser welding process to occur without directly exposing the electrode assembly to harmful factors
2Stability of the object's composition
If the top cover is welded directly to the housing at the edge of the accommodating space, then the sealing is improved, but the electrode assembly is exposed to laser and particles
Solution Approach 1:
The protection mechanism is added in the vertical dimension by extending a protrusion upward from the housing or downward from the top cover into the accommodating space. This dimensional addition creates a three-dimensional barrier that blocks harmful factors from reaching the electrode assembly while maintaining the two-dimensional sealing connection between the top cover and housing
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 protrusion effectively prevents laser leakage and particle intrusion, protecting the electrode assembly and ensuring a secure connection and sealing of the battery cell.
Implementation Method 1
the protrusion is configured to shield between the electrode assembly and at least a portion of the connection at which the top cover is connected to the housing
Implementation Method 2
cooperation between the protrusion and the housing can block laser or falling particles during welding, and prevent laser or particles from entering the accommodating space
Data Source
Figure 1~2
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Figure 5~6
AI summary
A battery cell (20), a battery, and an electric apparatus are provided. The battery cell (20) includes: a housing (22), where the housing (22) forms an accommodating space; an electrode assembly (21), where the electrode assembly (21) is disposed within the accommodating space; a top cover (23), where the top cover (23) is connected to the housing (22) and covers the accommodating space, the top cover (23) is provided with a protrusion (231), the protrusion (231) is located within the accommodating space, and the protrusion (231) is configured to shield between the electrode assembly (21) and at least a portion of the connection at which the top cover (23) is connected to the housing (22). By providing the protrusion (231) on the top cover (23), cooperation between the protrusion (231) and the housing (22) can block laser or falling particles during welding, and prevent laser or particles from entering the accommodating space and thus causing damage to the electrode assembly (21).