System and method for detecting tab welding quality of flexibly-packaged battery cell module

Abstract

The invention discloses a system and a method for detecting the tab welding quality of a flexibly packaged battery cell module, and belongs to the field of new energy vehicles. A battery module walking assembly is installed on a first guide rail on the machine table, the vibration leveling assembly and the detection assembly are installed on the same side of the first guide rail, an ultrasonic welding machine welding head in the vibration leveling assembly and a line laser measuring instrument sensing head in the detection assembly are both located above the first guide rail, and the sensing head is arranged at the downstream position of the welding head in the working procedure. According to the system, related control programs can be flexibly set according to different weld joint positions and numbers of different battery modules, the welding head vibrates on the busbar near the weld joint by setting the downward pressure of the welding head and the like; according to the method, thewelding seam with poor welding is loosened and tilted, whether the welding seam is welded or not is judged by photographing and scanning, and whether the welding is qualified is judged by measuring the relative height difference between the tab and the busbar, so that the tab welding seam subjected to laser welding meets the requirements of the welding position and reliably fits the busbar.

Description

technical field [0001] The invention belongs to the field of new energy vehicles, and in particular relates to a system and method for detecting the welding quality of tabs of a soft-pack battery module. Background technique [0002] New energy vehicles need to use various battery packs to provide power sources for vehicles through series and parallel connection. The cells in the battery pack come in forms such as hard shells and soft packs. The present invention is aimed at the soft pack electric core. After the soft-packed cells are assembled into a module, it is generally necessary to connect the tabs to the busbar, so that each individual cell can form a required series-parallel connection to ensure that the module reliably outputs stable DC voltage and capacity. Laser welding is one of the most commonly used methods at present. After the tab is welded to the bus bar, it is generally required to detect the welding position after the tab (the tab material is copper, al...

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Problems solved by technology

[0007] The purpose of the present invention is to overcome the defects of the prior art. In order to solve the problems of low efficiency of manually tilting the edge of the tabs for observation, easy fatigue of the operator, and the problem that the production cycle of the module is affected by the vibration test after the module is fixed to the vibrating table, it is proposed A system and method for judging the quality of laser welding of tabs of soft-pack battery modules

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