Abstract: Provided is a battery module including: A battery module comprising: a plurality of battery cells; a housing accommodating the plurality of battery cells therein, wherein the housing includes a first base material member and a second base material member, the first base material member and the second base material member are in contact with each other to form a joining region, a weld joint is formed in the joining region by welding, and a surface treatment region is formed in the joining region by laser emission, thus increasing an accuracy of a welding position between the base materials, which results in an increased welding process ability and an improved welding quality of the module.

Abstract: Provided is a fabrication method of a battery module case accommodating a battery cell, the method including: operation (a) of inputting a first base material member and a second base material member included in the case which accommodates the battery cell therein; operation (b) of performing a surface treatment by emitting a laser to a surface region including a joining region formed by contacting the first base material member and the second base material member with each other; and operation (c) of forming a weld joint by emitting the laser to the joining region, thus increasing a recognition rate in operating an auto position alignment (APA) function regardless of a surface condition of the base material of the battery module case.

Abstract: An apparatus for predicting weld quality includes an image sensor acquiring an image of a welding portion of a workpiece, a storage storing a shape detection model, a depth prediction model and a strength prediction model, and a controller configured to acquire shapes of a melt pool and a keyhole by receiving the image and inputting the image to the shape detection model, acquire a penetration depth of the keyhole by inputting the shapes of the melt pool and the keyhole to the depth prediction model, and acquire a tensile strength by inputting one of the shape of the melt pool, the shape of the keyhole and the shapes of the melt pool and the keyhole and the penetration depth of the keyhole to the strength prediction model. The weld quality of all products may be predicted during a welding process.