Low-Reflectivity Current Collector Plate for Precision Laser Welding
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Solution Overview
Problem
Existing laser welding techniques for connecting current collector plates to rolled cores in battery manufacturing often result in poor weld quality, with issues such as incomplete fusion of weld spots and overheating leading to potential explosions.
Innovation Solution
A battery current collector plate with a weld zone of low laser reflectivity is introduced, which absorbs laser energy more effectively, improving welding efficiency and precision, and reducing heat generation to safeguard the rolled core assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If laser welding is used to connect current collector plate to rolled core, then welding speed is increased and weld quality is improved, but laser reflectivity of the current collector plate causes incomplete fusion of weld spots
Solution Approach 1:
The patent changes the surface properties of the current collector plate by creating a weld zone with modified laser reflectivity. This parameter change allows the same laser welding process to achieve both high welding speed and complete weld spot fusion, resolving the contradiction between productivity and weld quality.
Solution Approach 2:
The patent applies local quality modification by creating a specific weld zone on the current collector plate with distinct surface properties (lower laser reflectivity) compared to the rest of the plate. This localized treatment ensures reliable welding at the contact area while maintaining the overall integrity and properties of the current collector plate.
2Reliability
If laser welding parameters are increased to compensate for poor weld quality, then weld fusion is improved, but heat generation increases causing potential overheating and explosion of rolled core
Solution Approach 1:
The patent changes the optical parameter (laser reflectivity) of the current collector plate surface at the weld zone, enabling effective laser energy absorption at lower laser power settings. This resolves the contradiction by achieving complete weld fusion without excessive heat generation that could cause rolled core explosion.
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 solution enhances the quality and stability of the welding process, preventing issues like incomplete welds and overheating, thereby improving production yield and ensuring battery safety.
Implementation Method 1
the weld zone has a lower laser reflectivity than the first face... such that a surface of the current collector plate absorbs laser energy more effectively
Implementation Method 2
The principle of laser welding is to use a high-energy laser beam to heat a welding material, so that a surface thereof melts
Implementation Method 3
use a high-energy laser beam to heat a welding material, so that a surface thereof melts, and forms a stable welded connection after cooling
Data Source
AI summary
A battery current collector plate and a battery, the current collector plate comprising a current collector plate body and a weld zone, the current collector plate body having a first face for contacting a rolled core, and a second face opposite the first face; at least a portion of the second face is provided with the weld zone, and the weld zone has a lower laser reflectivity than the first face. In the present utility model, the weld zone of low laser reflectivity is provided on the current collector plate, such that a surface of the current collector plate absorbs laser energy more effectively, thereby increasing the efficiency and precision of welding. At the same time, the weld zone of low laser reflectivity can also reduce the temperature and the amount of heat generated during laser welding, thereby safeguarding the performance and stability of a rolled core assembly.