Energy storage welding nail quality issues

How does welding instability affect the performance of power batteries?

However, on large-scale automatic production lines, on-site uncertainties such as material inhomogeneity, residual impurities, and parameter fluctuations increase the welding instability and easily lead to welding defects, which will seriously affect the quality and performance of power batteries [ 3, 4 ].

Is there a quality assurance approach for laser welding?

Of course, if someone looks beyond the battery welding applications many in-process quality assurance approaches are available for welding . In the case of laser welding, the in- process monitoring is mainly based on imaging, acoustic emission, and E/M signal techniques in general .

How can a quality feature of a weld be correlated?

Their common point is that they are practically investigating how the process emissions, the input parameters, or/and the variables can be correlated to a quality feature of the weld mainly using empirical or data-driven approaches [18, 19].

Can laser welding lead to defects?

However, due to the high reflectivity of aluminum to the laser and the high tendency of parts to retain impurities such as stamping oil and cleaning agents, it is easy to lead to defects during the laser welding process.

How can bpnn be used to evaluate weld defects?

For example, contour-based and OTSU threshold segmentation methods were used to extract keyhole features and weld width, and a back propagation neural network (BPNN) was trained to evaluate welding defects [ 8 ].

How do laser welders produce high-quality images?

To obtain high-quality images, an optical inspection system is embedded in the laser welder on the production line, consisting of an industrial camera and an LED-stabilized light source. Batteries are clamped on the assembly line by a bracket, and the light source is placed vertically above the assembly line.